逻辑开关K0～K7代表竞赛抢答按钮0～7号，当某个逻辑电平开关置“１”时，相当某组抢答按钮按下。在七段数码管上将其组号（0～7）显示出来，并使微机扬声器响一下。-The logic switching K0 to K7 behalf of the contest Qiangda button 0 to 7, when a logic level switch is set to " 1" , quite a group Responder button press. Its gr