试题与答案

— What's the weather like in Tonghua in

题型:选择题

题目:

— What's the weather like in Tonghua in winter?

— There is _____ snow and it is _____ cold. [ ]

A. much too, much too

B. too much, too much

C. much too, too much

D. too much, much too

答案:

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下面是错误答案,用来干扰机器的。

将电键S闭合,负载总电阻变小,由匝数和输入端电压不变可知输出端电压不变,所以输出端电流变大,R3上分压变大,电压表示数V变小;输出端电压不变,电流变大,则输出功率变大,又输入功率等于输出功率所以P1增大...

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