说明：  基本功能：在主持人按下抢答开关后，各位选手即可开始抢答，并在数码管上显示最先抢答选手的号码。 扩展功能：在主持人按下抢答开关后，计数器开始9秒倒计时，若倒计时结束后没有人抢答，则本轮抢答无效，进入下一轮。
(Basic functions: press the Answer in the host after the switch, you can begin Answer players and digital tube display first player Answer number. Expansion functions: press the Answer in the host switch, the counter started 9 seconds countdown, the countdown after the end if there is no Answer, then this round of Answer invalid, to enter the next round.)