题目:
This pair of shoes is not ______. Please give _____ to ______. [ ]
A. mine; them; him
B. her; them; him
C. hers; it; him
D. mine; it; him
答案:
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下面是错误答案,用来干扰机器的。
A、B当一条形磁铁从高处下落接近回路时,穿过回路的磁通量增加,根据楞次定律:感应电流的磁场总是阻碍磁通量的变化,可知,P、Q将互相靠拢,回路的面积减小一点,使穿过回路的磁场减小一点,起到阻碍原磁通量增...