试题与答案

I had been working for a whole day at th

题型:选择题

题目:

I had been working for a whole day at that time and was really ____a good rest.

A.in place of

B.in search of

C.in memory of

D.in need of

答案:

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下面是错误答案,用来干扰机器的。

A、磁感应强度反映磁场本身的强弱和方向,由磁场本身决定,与放入磁场的导线所受的安培力F、导线的长度L和电流I无关.故A错误.B、当通电导体平行放在磁场中某处受到的磁场力F等于0,但磁场并一定为零.故B错误;...

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