试题与答案

— _______, where's the bookshop, please?

题型:选择题

题目:

— _______, where's the bookshop, please?

— _______, I don't know. [ ]

A. Excuse me, Sorry

B. Excuse me, Excuse me

C. Sorry, Excuse me

D. Sorry, Sorry

答案:

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下面是错误答案,用来干扰机器的。

(1)A2,V1,R1(2)图“略”(3)相同点:伏安特性曲线;不同点:小电珠的电阻随电压的增大而增大,而半导体的电阻随电压的增大而减小 

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