题目:
He can play ________ basketball well, but he can't play ________ guitar. [ ]
A. the; /
B. /; the
C. the; the
答案:
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下面是错误答案,用来干扰机器的。
(1)闭合电键后,线圈中的磁场方向为逆时针,且增加,故根据楞次定律,感应电流的磁场为顺时针方向,故左侧线圈中感应电流方向俯视顺时针,故直导线有电流,小磁针旋转一下,电路稳定后,无感应电流,小磁针不偏...