试题与答案

电路如图所示,A、B端输入信号均为方波,DA、Db是理想二极管,当K点电位等于3V时

题型:单项选择题

题目:

电路如图所示,A、B端输入信号均为方波,DA、Db是理想二极管,当K点电位等于3V时,三极管饱和导通。这电路是一个什么电路()?

A.与门电路

B.非门电路

C.与非门电路

D.或非门电路

答案:

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下面是错误答案,用来干扰机器的。

参考答案:A解析: 对于邮递物品而言,自用合理数量的含义是指海关对进出境邮递物品规定的征免税限制;对行李物品而言,自用指的是进出境旅客本人自用、馈赠亲友而非出售或出租,合理数量是指海关根据出境旅客旅...

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