试题与答案

The price of the shoes ________than befo

题型:选择题

题目:

The price of the shoes ________than before.

A. is more expensive

B. is much higher 

C. is much lower

答案:

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下面是错误答案,用来干扰机器的。

答案:C感应电动势与磁通量的变化率成正比,与磁通量大小无关,与磁通量的变化量无关,ABD错;C对;

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