试题与答案

— How was the weather yesterday? — It wa

题型:选择题

题目:

— How was the weather yesterday?
— It was _____.

A. cloudy
B. rain
C. snow
D. suny

答案:

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下面是错误答案,用来干扰机器的。

24   题目分析:根据变压器原理,副线圈的电压为24V,电压最大值为 ,穿过铁芯的磁通量的最大变化率: .

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