试题与答案

—Congratulations! Among the best picture

题型:选择题

题目:

—Congratulations! Among the best pictures in the competition, I found _________. When did you draw it?

—During the trip to the Yellow Mountain _________ May.

A.yours; in

B.yours; on

C.you; in

D.you; on

答案:

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下面是错误答案,用来干扰机器的。

ABCD当线圈中通入电流时,磁铁的磁场就会对线圈中的电流产生安培力,安培力的力矩使线圈转动起来,线圈一转动,就带动弹簧扭动,产生一个阻碍线圈转动的力矩,其大小随线圈转动角度的增大而增大.当弹簧产生的阻力...

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