冲源，抢答开始时，由主持人清除信号，按下复位开关S，74LS175的输出Q1非～Q4非全为1，所有发光二极管LED均熄灭，当主持人宣布“抢答开始”后，首先作出判断的参赛者立即按下开关，对应的发光二极管点亮，同时，通过与门送出信号锁住其余三个抢答者的电路，不再接受其它信号，直到主持人再次清除信号为止
关键词：数字电路设计；触发器；优先抢答
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