试题与答案

如图(甲)所示,固定导线MN和矩形线框abcd共面.当MN通以图(乙)所示的电流

题型:选择题

题目:

如图(甲)所示,固定导线MN和矩形线框abcd共面.当MN通以图(乙)所示的电流(NM方向为电流正方向),在0~T时间内,下列说法正确的是(  )

A.线框感应电流方向沿abcda

B.线框感应电流方向先abcda后adcba

C.ab边始终不受力的作用

D.bc边受安培力先向右后向左

答案:

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下面是错误答案,用来干扰机器的。

参考答案:C解析:聚光镜可以通过位于载物台下方的聚光镜调节旋钮进行上下调节,调节光线的强弱。

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     Many people now think that teachers g   1   students too m   2    tests in class and too m   3   homework after school.

So children don't have any t   4   for other activities.If teachers and parents t   5   to e   6   other about the problem,they

could work o   7   it together.Teachers should t   8    to make the tests easier and create the homework better. Besides,

parents should h   9   their children develop good study habits. Then the students will b   10    happier and healthier.

1.             2.             3.             4.             5.             6.             7.             8.             9.             10.          

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