说明：  基于8051单片机的抢答器设计，有四种工作状态的切换，由两个开关控制，兼备记分牌的作用，硬件电路中有一个3线8线优先编码器，节省IO口
(Responder 8051-based design, there are four working state switching, the role of the two switches control both the scoreboard, the hardware circuit has a 3-wire 8-wire priority encoder, saving IO port)