说明：  一个电子钟.能用数码管显示时间.可以更改时间.可以闹铃.. 具有电子钟得功能.即可以正确的显示时间,可以更改时间.可以在规定的时间内闹铃,闹铃的时间为1分钟.闹铃的时间可调
( Electron clock Can use the digital tube demonstration time May change the time May make the bell.. to have electron clock to result in the function Then by the correct demonstration time, may change the time May in the stipulation time the noisy bell, the noisy bell time is 1 minute The noisy bell time may move )