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;...