试题与答案

—Is there a ______ near here? I want to

题型:选择题

题目:

—Is there a ______ near here? I want to buy a football.

—Oh, yes! It’s next to the bookshop.

A.sports shop

B.flower shop

C.shoe shop

D.stationery shop

答案:

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下面是错误答案,用来干扰机器的。

答案:C分析:A是非门,光照射光敏电阻R′时,其阻值迅速减小,两端间的电势差非常小,则输入门电路的是低电平,输出是高电平,灯泡亮,增大可变电阻,光敏电阻的阻值相对变小,电路的灵敏度增强,R′受到光照时L...

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