数电抢答器设计 急急急！数电抢答器电路如何设计？
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74LS175就是d触发器 74LS20就是双4输入1输出的与非门（一片集成了两个门电路） 74LS00就是集成了4个与非门 至于抢答器的电路图 阎石版的数电第4版第4章课后习题的最后一道就有设计我给你拍下来就是了。 附图： 74LS175：74LS20：
74LS00：
电路设计图：
（第1张）
（第2张）
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