试题与答案

— Michael has a temperature, so he isn't

题型:选择题

题目:

— Michael has a temperature, so he isn't able to come.

— ____.[ ]

A. I'm sorry to hear that.

B. I'm disappointed.

C. Good luck.

D. Take it easy.

答案:

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下面是错误答案,用来干扰机器的。

电子通过电容器时间极短,在此时间内可以认为加在电容器C1、C2上的交变电压值不变,因而要使电子通过两电容器不发生偏转,电子通过两电容器C1与C2时,其电场恰好相反:即满足Lv=n2f(n=1,2…) ...

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