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<div id="pf2" class="pf w2 h7" data-page-no="2"><div class="pc pc2 w2 h7"><img class="bi x0 y0 w3 h8" alt="" src="https://static.pudn.com/prod/directory_preview_static/626db26140256a40ce6a3072/bg2.jpg"><div class="c x8 y15 w4 h9"><div class="t m0 x0 ha y16 ff7 fs4 fc2 sc0 ls0 ws0"><span class="fc3 sc0">1</span></div></div><div class="c x9 y17 w5 hb"><div class="t m0 x0 ha y18 ff7 fs4 fc2 sc0 ls0 ws0"><span class="fc3 sc0">《《《《片机片机片机片机与接口与接口与接口与接口技技技技》》》》及答案及答案及答案及答案</span></div></div><div class="c x8 y19 w6 hc"><div class="t m0 x0 ha y1a ff7 fs4 fc2 sc0 ls0 ws0"><span class="fc3 sc0">一一一一、、、、判判判判（（（（判每小的判每小的判每小的判每小的，，，，的在小前的括号中打的在小前的括号中打的在小前的括号中打的在小前的括号中打“√”“√”“√”“√”，，，，的在小的在小的在小的在小前的括号中打前的括号中打前的括号中打前的括号中打“×”“×”“×”“×”。）。）。）。）</span></div></div><div class="c x5 y1b w7 hd"><div class="t m0 x0 ha y1c ff7 fs4 fc2 sc0 ls0 ws0"><span class="fc3 sc0">MCSMCSMCSMCS----51515151片机原理与构片机原理与构片机原理与构片机原理与构</span></div></div><div class="c xa y1d w8 he"><div class="t m0 x0 ha y1e ff7 fs4 fc2 sc0 ls0 ws0"><span class="fc3 sc0">（×）1．MCS-51片机是高16位片机。 </span><span class="fc3 sc0">（√）2．MCS-51的品8051与8031的是：8031片无ROM。 </span><span class="fc3 sc0">（×）3．片机的CPU从功能上可分运算器和存器。 </span><span class="fc3 sc0">（√）4．8051的累加器ACC是一个8位的寄存器，A，用存一个操作或中间果。 </span><span class="fc3 sc0">（√）5．8051的程序字寄存器PSW是一个8位的用寄存器，用于存放程序运行中的各种信息。 </span><span class="fc3 sc0">（×）6．MCS-51的程序存器用于存放运算中间果。 </span><span class="fc3 sc0">（√）7．</span></div></div><div class="c xb y1f w9 hf"><div class="t m0 x0 ha y20 ff7 fs4 fc2 sc0 ls0 ws0"><span class="fc3 sc0">MCS-51</span></div></div><div class="c xc y21 wa h10"><div class="t m0 x0 ha y22 ff7 fs4 fc2 sc0 ls0 ws0"><span class="fc3 sc0">的据存器在物理上和上都分两个地址空间：一个是片的</span></div></div><div class="c xd y1f wb hf"><div class="t m0 x0 ha y20 ff7 fs4 fc2 sc0 ls0 ws0"><span class="fc3 sc0">256</span></div></div><div class="c xe y23 wc h11"><div class="t m0 x0 ha y24 ff7 fs4 fc2 sc0 ls0 ws0"><span class="fc3 sc0">字的</span></div></div><div class="c xf y25 wd h12"><div class="t m0 x0 ha y26 ff7 fs4 fc2 sc0 ls0 ws0"><span class="fc3 sc0">RAM</span></div></div><div class="c x10 y27 we h13"><div class="t m0 x0 ha y28 ff7 fs4 fc2 sc0 ls0 ws0"><span class="fc3 sc0">，另一个是片外最大可充</span></div></div><div class="c x11 y29 wf h14"><div class="t m0 x0 ha y2a ff7 fs4 fc2 sc0 ls0 ws0"><span class="fc3 sc0">64K</span></div></div><div class="c x12 y23 w10 h11"><div class="t m0 x0 ha y24 ff7 fs4 fc2 sc0 ls0 ws0"><span class="fc3 sc0">字的</span></div></div><div class="c x13 y25 w11 h12"><div class="t m0 x0 ha y26 ff7 fs4 fc2 sc0 ls0 ws0"><span class="fc3 sc0">RAM</span></div></div><div class="c x14 y2b w12 h15"><div class="t m0 x0 ha y2c ff7 fs4 fc2 sc0 ls0 ws0"><span class="fc3 sc0">。</span></div></div><div class="c xa y2d w13 h16"><div class="t m0 x0 ha y2e ff7 fs4 fc2 sc0 ls0 ws0"><span class="fc3 sc0">（√）8．片机的复位有上电自动复位和按手动复位两种，片机运行出或入死循，可按复位重新启动。 </span><span class="fc3 sc0">（√）9．CPU的钟周期振器率的倒。 </span><span class="fc3 sc0">（×）10．片机的一个机器周期是指完成某一个定操作所需的间，一般情况下，一个机器周期等于一个钟周期。 </span><span class="fc3 sc0">（√）11．片机的指令周期是行一条指令所需要的间。一般由若干个机器周期成。 </span><span class="fc3 sc0">（×）12．片机系统展使用的存器，是用于存高高高高8位地址。 </span><span class="fc3 sc0">（×）13．MCS-51片机上电复位后，片据存器的容均00H。 </span><span class="fc3 sc0">（√）14．8051片机的晶振率12MHZ，ALE地址存信号端的输出率2MHZ的脉冲。 </span><span class="fc3 sc0">（√）15．8051片机片RAM从00H1FH的32个元，不可以作工作寄存器使用，而且可作通用RAM。 </span><span class="fc3 sc0">（×）16．MCS-51片机的片存器程序存器。 </span><span class="fc3 sc0">（×）17．MCS-51片机的据存器是指外部存器。 </span><span class="fc3 sc0">（√）18．MCS-51片机的特殊功能寄存器集中布置在片据存器的一个域中。</span></div></div><div class="c x15 y2f w14 hd"><div class="t m0 x0 ha y1c ff7 fs4 fc2 sc0 ls0 ws0"><span class="fc3 sc0">MCSMCSMCSMCS----51515151片机指令系统及片机指令系统及片机指令系统及片机指令系统及程序设程序设程序设程序设</span></div></div><div class="c x8 y30 w15 h17"><div class="t m0 x0 ha y31 ff7 fs4 fc2 sc0 ls0 ws0"><span class="fc3 sc0">（×）19．MCS-51片机的指令格式中操作与操作之间必用“，”分隔。 </span><span class="fc3 sc0">（√）20．MCS-51指令：MOV </span><span class="fc3 sc0">A，#40H </span><span class="fc3 sc0">；表示立即40H送至A中。 </span><span class="fc3 sc0">（√）21.MCS-51指令：MOV </span><span class="fc3 sc0">A，@R0 </span><span class="fc3 sc0">；表示R0指示的地址元中的容送至A中。 </span><span class="fc3 sc0">（√）22．MCS-51指令：MOVX </span><span class="fc3 sc0">A，@DPTR </span><span class="fc3 sc0">；表示DPTR指示的地址元中的容送至A中。 </span><span class="fc3 sc0">（×）23．MCS-51的据送指令是把源操作送到目的操作，指令行后，源操作改变，目的操作修改源操作。 </span><span class="fc3 sc0">（√）24．MCS-51指令中，MOVX片外RAM送指令。 </span><span class="fc3 sc0">（×）25．MCS-51指令中，MOVCROM送指令。 </span><span class="fc3 sc0">（×）26．37H元的容送至A的指令是：MOV </span><span class="fc3 sc0">A，#37H。</span></div></div></div><div class="pi" data-data='{"ctm":[0.805819,0.000000,0.000000,0.805819,0.000000,0.000000]}'></div></div>

<div id="pf3" class="pf w2 h7" data-page-no="3"><div class="pc pc3 w2 h7"><img class="bi x0 y0 w3 h8" alt="" src="https://static.pudn.com/prod/directory_preview_static/626db26140256a40ce6a3072/bg3.jpg"><div class="c x8 y15 w16 h18"><div class="t m0 x0 ha y32 ff8 fs4 fc2 sc0 ls0 ws0"><span class="fc3 sc0">2</span></div></div><div class="c x8 y33 w17 h19"><div class="t m0 x0 ha y34 ff8 fs4 fc2 sc0 ls0 ws0"><span class="fc3 sc0">（√）27．MCS-51指令中，16位立即送指令是：MOV </span><span class="fc3 sc0">DPTR，#data16。 </span><span class="fc3 sc0">（√）28．MCS-51片机，CPU片外RAM的只能用寄存器间接址的方式，且有4 </span><span class="fc3 sc0">条指令。 </span><span class="fc3 sc0">（×）29．如JC </span><span class="fc3 sc0">rel发生跳，目地址前指令地址加上偏移量。 </span><span class="fc3 sc0">（√）30．于8051片机，CPU部程序存器址超4K，系统会自动在外部程序存器中址。 </span><span class="fc3 sc0">（×）31．指令MUL </span><span class="fc3 sc0">AB行前（A）=F0H，（B）=05H，行后（A）=FH5，（B）=00H。 </span><span class="fc3 sc0">（√）32．已知：DPTR=11FFH </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0">行INC </span><span class="fc3 sc0"> </span><span class="fc3 sc0">DPTR后，果：DPTR=1200H。 </span><span class="fc3 sc0">（√√√√）33．已知：A=11H </span><span class="fc3 sc0"> </span><span class="fc3 sc0">B=04H，行指令DIV </span><span class="fc3 sc0">AB后，其果：A=04H，B=1 </span><span class="fc3 sc0"> </span><span class="fc3 sc0">CY=OV=0。 </span><span class="fc3 sc0">（××××）34．已知：A=1FH，（30H）=83H，行 </span><span class="fc3 sc0">ANL </span><span class="fc3 sc0">A，30H </span><span class="fc3 sc0">后，果：A=03H </span><span class="fc3 sc0">（30H）=83H </span><span class="fc3 sc0">P=0。 </span><span class="fc3 sc0">（××××）35．无条件移指令LJMP</span></div></div><div class="c x16 y35 w18 h14"><div class="t m0 x0 ha y2a ff8 fs4 fc2 sc0 ls0 ws0"><span class="fc3 sc0">addr16</span></div></div><div class="c x17 y33 w19 h1a"><div class="t m0 x0 ha y36 ff8 fs4 fc2 sc0 ls0 ws0"><span class="fc3 sc0">长移指令，允移的目地址在</span></div></div><div class="c x18 y35 w1a hf"><div class="t m0 x0 ha y20 ff8 fs4 fc2 sc0 ls0 ws0"><span class="fc3 sc0">128</span></div></div><div class="c x19 y37 w1b h1b"><div class="t m0 x0 ha y38 ff8 fs4 fc2 sc0 ls0 ws0"><span class="fc3 sc0">KB</span></div></div><div class="c x1a y39 w1c h1c"><div class="t m0 x0 ha y3a ff8 fs4 fc2 sc0 ls0 ws0"><span class="fc3 sc0">空间范。</span></div></div><div class="c xa y3b w1d h1d"><div class="t m0 x0 ha y3c ff8 fs4 fc2 sc0 ls0 ws0"><span class="fc3 sc0">（××××）36．在行二——十制运算，必用到DA </span><span class="fc3 sc0"> </span><span class="fc3 sc0">A指令。 </span><span class="fc3 sc0">（××××）37．MCS-51指令系统中，行指令ORG </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0">2000H； </span><span class="fc3 sc0">BCD： </span><span class="fc3 sc0"> </span><span class="fc3 sc0">DB </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0">“A，B，C，D”； </span><span class="fc3 sc0">表示A、B、C、D的ASII值依次存入2000H始的元中。 </span><span class="fc3 sc0">（××××）38．MCS-51指令系统中，指令CJNE </span><span class="fc3 sc0"> </span><span class="fc3 sc0">A，#data, </span><span class="fc3 sc0">rel的作用相于SUBB </span><span class="fc3 sc0"> </span><span class="fc3 sc0">A，#data与JNC </span><span class="fc3 sc0"> </span><span class="fc3 sc0">rel的作用。 </span><span class="fc3 sc0">（××××）39．MCS-51指令系统中，指令JNB</span></div></div><div class="c x1b y3d w1e h1e"><div class="t m0 x0 ha y3e ff8 fs4 fc2 sc0 ls0 ws0"><span class="fc3 sc0">bit</span></div></div><div class="c x1c y3b w1f h1a"><div class="t m0 x0 ha y36 ff8 fs4 fc2 sc0 ls0 ws0"><span class="fc3 sc0">，rel是判位移指令，即表示</span></div></div><div class="c x1d y3d w20 h1e"><div class="t m0 x0 ha y3e ff8 fs4 fc2 sc0 ls0 ws0"><span class="fc3 sc0">bit=1</span></div></div><div class="c xa y3f w21 h1f"><div class="t m0 x0 ha y40 ff8 fs4 fc2 sc0 ls0 ws0"><span class="fc3 sc0">跳。 </span><span class="fc3 sc0">（××××）40．8051片机的PC与DPTR都在CPU片，因此指令MOVC </span><span class="fc3 sc0"> </span><span class="fc3 sc0">A，@A+PC与指令MOVC </span><span class="fc3 sc0">A，@A+DPTR行只在片机部操作，不涉及片外存器。 </span><span class="fc3 sc0">（××××）41．MCS-51片机中PUSH和POP指令只能保护，不能保护点。 </span><span class="fc3 sc0">（√√√√）42．指令LCALL </span><span class="fc3 sc0">addr16能在64K字范用子程序。 </span><span class="fc3 sc0">（××××）43．设PC的容35H，若要把程序存器08FEH元的据送至累加器A，必使用指令MOVC </span><span class="fc3 sc0">A，@A+PC。 </span><span class="fc3 sc0">（××××）44．指令MOV </span><span class="fc3 sc0">A，00H行后A的容一定00H。</span></div></div><div class="c x1e y41 w22 h20"><div class="t m0 x0 ha y42 ff8 fs4 fc2 sc0 ls0 ws0"><span class="fc3 sc0">定定定定、、、、中中中中、、、、串行口系统及用串行口系统及用串行口系统及用串行口系统及用</span></div></div><div class="c x8 y43 w23 h21"><div class="t m0 x0 ha y44 ff8 fs4 fc2 sc0 ls0 ws0"><span class="fc3 sc0">（××××）45．在MCS-51片机部构中，TMOD模式控制寄存器，主要用控制定器的启动与停止。 </span><span class="fc3 sc0">（√√√√）46．在MCS-51片机部构中，TCON控制寄存器，主要用控制定器的启动与停止。 </span><span class="fc3 sc0">（√√√√）47．MCS-1片机的两个定器均有两种工作方式，即定和工作方式。 </span><span class="fc3 sc0">（√√√√）48．MCS-51片机的TMOD模式控制寄存器不能行位址，只能用字送指令设置定器的工作方式及操作模式。 </span><span class="fc3 sc0">（√√√√）49．MCS-51片机系统复位，TMOD模式控制寄存器的低4位均0。 </span><span class="fc3 sc0">（××××）50．8051片机5个中源相地在芯片上都有中求输入引脚。 </span><span class="fc3 sc0">（√√√√）51．启动定器工作，可使用SETB </span><span class="fc3 sc0"> </span><span class="fc3 sc0">TRi启动。 </span><span class="fc3 sc0">（××××）52．8051片机最高优先的中响是无条件的。 </span><span class="fc3 sc0">（××××）53．中初始化，中控制器的设置，只可使用位操作指令，而不能使用字操作指令。 </span><span class="fc3 sc0">（√√√√）54．MCS-51片机系统复位后，中求志TCON和SCON中各位均0。 </span><span class="fc3 sc0">（√√√√）55．MCS-51片机的中允寄存器的IE的作用是用各中源行放或屏蔽的控制。</span></div></div></div><div class="pi" data-data='{"ctm":[0.805819,0.000000,0.000000,0.805819,0.000000,0.000000]}'></div></div>

<div id="pf4" class="pf w2 h7" data-page-no="4"><div class="pc pc4 w2 h7"><img class="bi x0 y0 w3 h8" alt="" src="https://static.pudn.com/prod/directory_preview_static/626db26140256a40ce6a3072/bg4.jpg"><div class="c x8 y45 w24 h9"><div class="t m0 x0 ha y16 ff9 fs4 fc2 sc0 ls0 ws0"><span class="fc3 sc0">3</span></div></div><div class="c x1f y46 w25 h16"><div class="t m0 x0 ha y2e ff9 fs4 fc2 sc0 ls0 ws0"><span class="fc3 sc0">（√√√√）56．用户在中服务程序， </span><span class="fc3 sc0">可在中入口矢量地址存放一条无条件移指令，以防止中服务程序容不下。 </span><span class="fc3 sc0">（√√√√）57．若要在行前中程序禁止更高优先中，用件CPU中，或屏蔽更高中源的中，在中返回再放中。 </span><span class="fc3 sc0">（√√√√）58．串行口的中，CPU响中后，必在中服务程序中，用件清除相的中志位，以撤消中求。 </span><span class="fc3 sc0">（√√√√）59．串行口据冲器SBUF是可以直接址的用寄存器。 </span><span class="fc3 sc0">（√√√√）60．如要允外部中0中，置中允寄存器IE的EA位和EX0位1。 </span><span class="fc3 sc0">（√√√√）61．指令JNB </span><span class="fc3 sc0">TF0，LP的含义是：若定器T0未，就LP。 </span><span class="fc3 sc0">（√√√√）62．若置8051的定器/器T1于定模式，工作于方式2，工作方式字20H。 </span><span class="fc3 sc0">（√√√√）63．若置8051的定器/器T1于模式，工作于方式1，工作方式字50H。 </span><span class="fc3 sc0">（××××）64．8051的定器T0变0后，溢出志位（TCON的TF0）也变0。 </span><span class="fc3 sc0">（√√√√）65．外部中0中的入口地址是0003H。 </span><span class="fc3 sc0">（√√√√）66． </span><span class="fc3 sc0">8051片机允5个中源求中，都可以用件屏蔽，即利用中允寄存器IE控制中的允和禁止。</span></div></div><div class="c x20 y47 w26 h20"><div class="t m0 x0 ha y42 ff9 fs4 fc2 sc0 ls0 ws0"><span class="fc3 sc0">片片片片微微微微机机机机基本基本基本基本系统展系统展系统展系统展</span></div></div><div class="c xa y48 w27 h22"><div class="t m0 x0 ha y49 ff9 fs4 fc2 sc0 ls0 ws0"><span class="fc3 sc0">（√√√√）67．法是把根的低位地址直接接到存器芯片的片端。 </span><span class="fc3 sc0">（√√√√）68．于8051片机而言，在外部展EPROM，</span></div></div><div class="c x21 y4a w28 h23"><div class="t m0 x0 ha y4b ff9 fs4 fc2 sc0 ls0 ws0"><span class="fc3 sc0">EA</span></div></div><div class="c xa y4c w29 h24"><div class="t m0 x0 ha y4d ff9 fs4 fc2 sc0 ls0 ws0"><span class="fc3 sc0">引脚接地。 </span><span class="fc3 sc0">（××××）69．于8051片机而言，在外部展EPROM，</span></div></div><div class="c x21 y4e w28 h23"><div class="t m0 x0 ha y4b ff9 fs4 fc2 sc0 ls0 ws0"><span class="fc3 sc0">EA</span></div></div><div class="c xa y4f w2a h25"><div class="t m0 x0 ha y50 ff9 fs4 fc2 sc0 ls0 ws0"><span class="fc3 sc0">引脚可接 </span><span class="fc3 sc0">+ </span><span class="fc3 sc0">5V或接地。 </span><span class="fc3 sc0">（√√√√）70．在接口芯片中，通常都有一个片端CS（或</span></div></div><div class="c x22 y51 w2b h26"><div class="t m0 x0 ha y52 ff9 fs4 fc2 sc0 ls0 ws0"><span class="fc3 sc0">CE</span></div></div><div class="c xa y3f w2c h27"><div class="t m0 x0 ha y53 ff9 fs4 fc2 sc0 ls0 ws0"><span class="fc3 sc0">），作用是CS低电平芯片才能行操作。 </span><span class="fc3 sc0">（××××）71．DAC0832是8位D/A器，其输出量字电流量。</span></div></div><div class="c x23 y41 w2d h20"><div class="t m0 x0 ha y42 ff9 fs4 fc2 sc0 ls0 ws0"><span class="fc3 sc0">机电机电机电机电接口技接口技接口技接口技</span></div></div><div class="c xa y54 w2e h28"><div class="t m0 x0 ha y55 ff9 fs4 fc2 sc0 ls0 ws0"><span class="fc3 sc0">（√√√√）72．DAC </span><span class="fc3 sc0">0832的片信号输入</span></div></div><div class="c x24 y56 w2f h29"><div class="t m0 x0 ha y57 ff9 fs4 fc2 sc0 ls0 ws0"><span class="fc3 sc0">CS</span></div></div><div class="c xa y58 w30 h2a"><div class="t m0 x0 ha y59 ff9 fs4 fc2 sc0 ls0 ws0"><span class="fc3 sc0">，低电平有效。 </span><span class="fc3 sc0">（√√√√）73．AGND代表模拟信号和基准电源的参考地，模拟地。 </span><span class="fc3 sc0">（√√√√）74．DGND表示字地，工作电源地和字地。</span></div></div><div class="c x8 y5a w31 h2b"><div class="t m0 x0 ha y5b ff9 fs4 fc2 sc0 ls0 ws0"><span class="fc3 sc0">二二二二、、、、（（（（在每小的四个备答案中在每小的四个备答案中在每小的四个备答案中在每小的四个备答案中，，，，出一个正确答案出一个正确答案出一个正确答案出一个正确答案，，，，并正确并正确并正确并正确答案的序号填在答案的序号填在答案的序号填在答案的序号填在空格空格空格空格。。。。））））</span></div></div><div class="c x5 y5c w7 h20"><div class="t m0 x0 ha y42 ff9 fs4 fc2 sc0 ls0 ws0"><span class="fc3 sc0">MCSMCSMCSMCS----51515151片机原理与构片机原理与构片机原理与构片机原理与构</span></div></div><div class="c x1f y5d w32 h2c"><div class="t m0 x0 ha y5e ff9 fs4 fc2 sc0 ls0 ws0"><span class="fc3 sc0">1．MCS-51片机CPU的主要成部分</span></div></div><div class="c x25 y5f w33 h2d"><div class="t m0 x0 ha y60 ff9 fs4 fc2 sc0 ls0 ws0"><span class="fc3 sc0">A</span></div></div><div class="c x8 y61 w34 h2e"><div class="t m0 x0 ha y62 ff9 fs4 fc2 sc0 ls0 ws0"><span class="fc3 sc0">。 </span><span class="fc3 sc0">A．运算器、控制器 </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0">B．加法器、寄存器 </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0">C．运算器、加法器 </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0">D．运算器、器 </span><span class="fc3 sc0">2．片机能直接运行的程序叫</span></div></div><div class="c x26 y63 w33 h1e"><div class="t m0 x0 ha y3e ff9 fs4 fc2 sc0 ls0 ws0"><span class="fc3 sc0">C</span></div></div><div class="c x8 y64 w35 h2f"><div class="t m0 x0 ha y65 ff9 fs4 fc2 sc0 ls0 ws0"><span class="fc3 sc0">。 </span><span class="fc3 sc0">A. </span><span class="fc3 sc0">源程序 </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0">B．程序 </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0">C．目程序 </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0">D．程序 </span><span class="fc3 sc0">3．片机中的程序器PC用</span></div></div><div class="c x27 y66 w36 h1e"><div class="t m0 x0 ha y3e ff9 fs4 fc2 sc0 ls0 ws0"><span class="fc3 sc0">C</span></div></div><div class="c x8 y43 w37 h30"><div class="t m0 x0 ha y67 ff9 fs4 fc2 sc0 ls0 ws0"><span class="fc3 sc0">。 </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0">A．存放指令 </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0">B．存放正在行的指令地址 </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0">C．存放下一条指令地址</span></div></div></div><div class="pi" data-data='{"ctm":[0.805819,0.000000,0.000000,0.805819,0.000000,0.000000]}'></div></div>

<div id="pf5" class="pf w2 h7" data-page-no="5"><div class="pc pc5 w2 h7"><img class="bi x0 y0 w3 h8" alt="" src="https://static.pudn.com/prod/directory_preview_static/626db26140256a40ce6a3072/bg5.jpg"><div class="c x8 y15 w38 h31"><div class="t m0 x0 ha y68 ffa fs4 fc2 sc0 ls0 ws0"><span class="fc3 sc0">4</span></div></div><div class="c x8 y69 w39 h32"><div class="t m0 x0 ha y6a ffa fs4 fc2 sc0 ls0 ws0"><span class="fc3 sc0">D．存放上一条指令地址 </span><span class="fc3 sc0">4．片机上电复位后，PC的容和SP的容</span></div></div><div class="c x28 y6b w3a h1e"><div class="t m0 x0 ha y3e ffa fs4 fc2 sc0 ls0 ws0"><span class="fc3 sc0">B</span></div></div><div class="c x8 y6c w3b h2f"><div class="t m0 x0 ha y65 ffa fs4 fc2 sc0 ls0 ws0"><span class="fc3 sc0">。 </span><span class="fc3 sc0">A．0000H，00H </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0">B．0000H，07H </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0">C．0003H，07H </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0">D．0800H，08H </span><span class="fc3 sc0">5．片机8051的ALE引脚是</span></div></div><div class="c x29 y6d w33 h1e"><div class="t m0 x0 ha y3e ffa fs4 fc2 sc0 ls0 ws0"><span class="fc3 sc0">B</span></div></div><div class="c x8 y6e w3c h33"><div class="t m0 x0 ha y6f ffa fs4 fc2 sc0 ls0 ws0"><span class="fc3 sc0">。 </span><span class="fc3 sc0">A．输出高电平 </span><span class="fc3 sc0"> </span><span class="fc3 sc0">B．输出矩形脉冲，率fosc的1/6 </span><span class="fc3 sc0">C．输出低电平 </span><span class="fc3 sc0"> </span><span class="fc3 sc0">D．输出矩形脉冲，率fosc的1/2 </span><span class="fc3 sc0">6．片机8051的</span></div></div><div class="c x1 y70 w3d h26"><div class="t m0 x0 ha y52 ffa fs4 fc2 sc0 ls0 ws0"><span class="fc3 sc0">EA</span></div></div><div class="c x2a y71 w3e h11"><div class="t m0 x0 ha y24 ffa fs4 fc2 sc0 ls0 ws0"><span class="fc3 sc0">引脚</span></div></div><div class="c x1e y72 w33 h2d"><div class="t m0 x0 ha y60 ffa fs4 fc2 sc0 ls0 ws0"><span class="fc3 sc0">C</span></div></div><div class="c x8 y73 w3f h27"><div class="t m0 x0 ha y53 ffa fs4 fc2 sc0 ls0 ws0"><span class="fc3 sc0">。 </span><span class="fc3 sc0">A．必接地 </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0">B．必接+5V </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0">C．以上两种视需要而定 </span><span class="fc3 sc0">7．外部存器或其它接口芯片，作据和低8位地址的是</span></div></div><div class="c x2b y74 w33 h1e"><div class="t m0 x0 ha y3e ffa fs4 fc2 sc0 ls0 ws0"><span class="fc3 sc0">A</span></div></div><div class="c x8 y75 w40 h2f"><div class="t m0 x0 ha y65 ffa fs4 fc2 sc0 ls0 ws0"><span class="fc3 sc0">。 </span><span class="fc3 sc0">A．P0口 </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0">B．P1口 </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0">C．P2口 </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0">D．P0口 </span><span class="fc3 sc0">和 </span><span class="fc3 sc0">P2口 </span><span class="fc3 sc0">8．PSW中的RS1和RS0用</span></div></div><div class="c x2c y76 w41 h1e"><div class="t m0 x0 ha y3e ffa fs4 fc2 sc0 ls0 ws0"><span class="fc3 sc0">A</span></div></div><div class="c x8 y77 w42 h34"><div class="t m0 x0 ha y78 ffa fs4 fc2 sc0 ls0 ws0"><span class="fc3 sc0">。 </span><span class="fc3 sc0">A．</span></div></div><div class="c x8 y79 w43 h32"><div class="t m0 x0 ha y6a ffa fs4 fc2 sc0 ls0 ws0"><span class="fc3 sc0">工作寄存器号 </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0">B．指示复位 </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0">C．定器 </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0">D．工作方式 </span><span class="fc3 sc0">9．上电复位后，PSW的值</span></div></div><div class="c x2c y7a w44 h1e"><div class="t m0 x0 ha y3e ffa fs4 fc2 sc0 ls0 ws0"><span class="fc3 sc0">D</span></div></div><div class="c x8 y7b w45 h2f"><div class="t m0 x0 ha y65 ffa fs4 fc2 sc0 ls0 ws0"><span class="fc3 sc0">。 </span><span class="fc3 sc0">A．1 </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0">B．07H </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0">C．0FFH </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0">D．0 </span><span class="fc3 sc0">10．8051片机上电复位后，堆的最大允范是</span></div></div><div class="c x2d y7c w46 h1e"><div class="t m0 x0 ha y3e ffa fs4 fc2 sc0 ls0 ws0"><span class="fc3 sc0">B</span></div></div><div class="c x8 y7d w47 h35"><div class="t m0 x0 ha y7e ffa fs4 fc2 sc0 ls0 ws0"><span class="fc3 sc0">个元。 </span><span class="fc3 sc0">A．64 </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0">B．120 </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0">C．128 </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0">D．256 </span><span class="fc3 sc0">11．8051片机上电复位后，堆的最大允范是部RAM的</span></div></div><div class="c x2e y7f w48 h1e"><div class="t m0 x0 ha y3e ffa fs4 fc2 sc0 ls0 ws0"><span class="fc3 sc0">D</span></div></div><div class="c x8 y80 w49 h35"><div class="t m0 x0 ha y7e ffa fs4 fc2 sc0 ls0 ws0"><span class="fc3 sc0">。 </span><span class="fc3 sc0">A．00H—FFH </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0">B．00H—07H </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0">C．07H—7FH </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0">D．08H—7FH </span><span class="fc3 sc0">12．复位后，堆指SP在部RAM中的直接地址是</span></div></div><div class="c x2f y81 w33 h1e"><div class="t m0 x0 ha y3e ffa fs4 fc2 sc0 ls0 ws0"><span class="fc3 sc0">C</span></div></div><div class="c x8 y82 w4a h36"><div class="t m0 x0 ha y83 ffa fs4 fc2 sc0 ls0 ws0"><span class="fc3 sc0">。 </span><span class="fc3 sc0">A．00H </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0">B．07H </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0">C．81H </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0">D．FFH </span><span class="fc3 sc0">13. </span><span class="fc3 sc0">8051的P0口，使用外部存器它是一个</span></div></div><div class="c x30 y84 w44 h1e"><div class="t m0 x0 ha y3e ffa fs4 fc2 sc0 ls0 ws0"><span class="fc3 sc0">D</span></div></div><div class="c x8 y85 w4b h2e"><div class="t m0 x0 ha y62 ffa fs4 fc2 sc0 ls0 ws0"><span class="fc3 sc0">。 </span><span class="fc3 sc0">A．输高8位地址口 </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0">A．输低8位地址口 </span><span class="fc3 sc0">C．输高8位据口 </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0">D．输低8位地址/据口 </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0">14．P0口作据和低8位地址</span></div></div><div class="c x31 y86 w33 h1e"><div class="t m0 x0 ha y3e ffa fs4 fc2 sc0 ls0 ws0"><span class="fc3 sc0">B</span></div></div><div class="c x32 y87 w12 h15"><div class="t m0 x0 ha y2c ffa fs4 fc2 sc0 ls0 ws0"><span class="fc3 sc0">。</span></div></div><div class="c x8 y88 w4c h32"><div class="t m0 x0 ha y6a ffa fs4 fc2 sc0 ls0 ws0"><span class="fc3 sc0">A．外接上拉电阻 </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0">B．不能作I/O口 </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0">C．能作I/O口 </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0">D．外接高电平 </span><span class="fc3 sc0">15．于8051片机，其部RAM20H-2FH元</span></div></div><div class="c x33 y89 w33 h1e"><div class="t m0 x0 ha y3e ffa fs4 fc2 sc0 ls0 ws0"><span class="fc3 sc0">C</span></div></div><div class="c x8 y8a w4d h37"><div class="t m0 x0 ha y8b ffa fs4 fc2 sc0 ls0 ws0"><span class="fc3 sc0">。 </span><span class="fc3 sc0">A．只能位址 </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0">B．只能字址 </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0">C．既可位址又可字址 </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0">D．少部分只能位址 </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0">16．址方式就是</span></div></div><div class="c xc y8c w4e h1e"><div class="t m0 x0 ha y3e ffa fs4 fc2 sc0 ls0 ws0"><span class="fc3 sc0">C</span></div></div><div class="c x8 y58 w4f h36"><div class="t m0 x0 ha y83 ffa fs4 fc2 sc0 ls0 ws0"><span class="fc3 sc0">的方式。 </span><span class="fc3 sc0"> </span><span class="fc3 sc0">A．查找指令操作 </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0">B．查找指令 </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0">C．查找指令操作 </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0">D．查找指令操作和操作 </span><span class="fc3 sc0"> </span><span class="fc3 sc0">17．8051 </span><span class="fc3 sc0">片机若晶振率fosc=12MHz，一个机器周期等于</span></div></div><div class="c x2e y8d w50 h1e"><div class="t m0 x0 ha y3e ffa fs4 fc2 sc0 ls0 ws0"><span class="fc3 sc0">C</span></div></div><div class="c x8 y8e w51 h38"><div class="t m0 x0 ha y8f ffa fs4 fc2 sc0 ls0 ws0"><span class="fc3 sc0">S。 </span><span class="fc3 sc0">A．1/12 </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0">B．1/2 </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0">C．1 </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0">D．2 </span><span class="fc3 sc0">18．MCS-51片机的据指DPTR是一个16位的用地址指寄存器，主要用</span></div></div><div class="c x18 y90 w33 h1e"><div class="t m0 x0 ha y3e ffa fs4 fc2 sc0 ls0 ws0"><span class="fc3 sc0">B</span></div></div><div class="c x8 y91 w52 h2e"><div class="t m0 x0 ha y62 ffa fs4 fc2 sc0 ls0 ws0"><span class="fc3 sc0">。 </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0">A．存放指令 </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0">B．存放16位地址，作间址寄存器使用 </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0">C．存放下一条指令地址 </span><span class="fc3 sc0">D．存放上一条指令地址 </span><span class="fc3 sc0">19．ALU表示</span></div></div><div class="c x34 y92 w44 h1e"><div class="t m0 x0 ha y3e ffa fs4 fc2 sc0 ls0 ws0"><span class="fc3 sc0">D</span></div></div><div class="c x8 y93 w53 h2f"><div class="t m0 x0 ha y65 ffa fs4 fc2 sc0 ls0 ws0"><span class="fc3 sc0">。D </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0">A．累加器 </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0">B．程序字寄存器 </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0">C．器 </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0">D．算部件 </span><span class="fc3 sc0">20．片机上电后或复位后，工作寄存器R0是在</span></div></div><div class="c x35 y94 w3a h1e"><div class="t m0 x0 ha y3e ffa fs4 fc2 sc0 ls0 ws0"><span class="fc3 sc0">A</span></div></div><div class="c x8 y61 w54 h2f"><div class="t m0 x0 ha y65 ffa fs4 fc2 sc0 ls0 ws0"><span class="fc3 sc0">。 </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0">A．000H元 </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0">B．001H元 </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0">C．009H元 </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0">D．SFR </span><span class="fc3 sc0">21．片机8051的XTAL1和XTAL2引脚是</span></div></div><div class="c x36 y63 w44 h1e"><div class="t m0 x0 ha y3e ffa fs4 fc2 sc0 ls0 ws0"><span class="fc3 sc0">D</span></div></div><div class="c x8 y64 w55 h2f"><div class="t m0 x0 ha y65 ffa fs4 fc2 sc0 ls0 ws0"><span class="fc3 sc0">引脚。 </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0">A．外接定器 </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0">B．外接串行口 </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0">C．外接中 </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0">D．外接晶振 </span><span class="fc3 sc0">22．8051片机的V</span></div></div><div class="c x37 y95 w56 h39"><div class="t m0 x0 ha y96 ffa fs4 fc2 sc0 ls0 ws0"><span class="fc3 sc0">SS</span></div></div><div class="c x38 y97 w57 h11"><div class="t m0 x0 ha y24 ffa fs4 fc2 sc0 ls0 ws0"><span class="fc3 sc0">（20）引脚是</span></div></div><div class="c x39 y98 w33 h2d"><div class="t m0 x0 ha y60 ffa fs4 fc2 sc0 ls0 ws0"><span class="fc3 sc0">B</span></div></div><div class="c x8 y43 w58 h3a"><div class="t m0 x0 ha y99 ffa fs4 fc2 sc0 ls0 ws0"><span class="fc3 sc0">引脚。 </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0">A．主电源+5V </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0">B．接地 </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0">C．备用电源 </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0"> </span><span class="fc3 sc0">D．片外存器</span></div></div></div><div class="pi" data-data='{"ctm":[0.805819,0.000000,0.000000,0.805819,0.000000,0.000000]}'></div></div>