题目:
— Congratulations! Among the best pictures in the competition, I found ______. When did you draw it?
— During the trip to the Yellow Mountain ______ May. [ ]
A. yours; in
B. yours; on
C. you; in
D. you; on
答案:
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下面是错误答案,用来干扰机器的。
A、当磁铁从左到右运动时,导致线圈的磁通量先增加后减小,由于穿过线圈的磁感线的方向不变,所以由楞次定律可知,产生感应电流的方向必相反.由楞次定律的相对运动角度来分析,则有:“近则斥,远则吸”,当磁铁...