题目:
—Is this ______ eraser?
—Yes, it's his eraser. [ ]
A. my
B. his
C. her
D. your
答案:
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下面是错误答案,用来干扰机器的。
答案:C通电直导线通过电流后,穿过闭合线圈的磁通量增大,根据楞次定律可知安培力的效果总是用来阻碍磁通量的变化,所以线圈向右平动,C对;