题目内容

I guess Professor Wang hasn’tfinished grading the papers yet. If he had, he would not keep us in_______ .

A.suspense
B.trouble
C.doubt
D.wonder

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黑表笔接三极管的基极，红表笔接另两极时，阻值均小为（）型三极管。

At the conferenceyesterday, our differences were further_______ .The next step is to work out a solution acceptable to both sides.

A.narrowed down
B.cooled down
C.driven home
D.brought about

一般硅材料二极管的正向电阻为几千欧。

A. 对
B. 错

正向电阻越小，反向电阻越大的二极管的质量越差。

A. 对
B. 错