一个以单片机为核心的具有定时功能的八位抢答器。抢答器同时供八位选手比赛，分别用八个开关控制。设置有一个系统清除和抢答控制开关，并由主持人控制。-A microcontroller as the core of the eight with a timer Responder. Responder same time for eight players race, respectively, with eight switch contr