八路抢答，各用一个抢答按钮； 设置一个控制开关，该开关由主持人控制；具有数据锁存和显示功能，抢答开始后若有选手按动抢答按钮，编号立即锁存，此外，要封锁输入电路，禁止其他选手抢答。(Eight road, each with one answer button; set a control switch, the switch is controlled by the moderator; has a data latch and display function, answer after th