题目:
The watch doesn't work. There is _________ [ ]
A. wrong something
B. wrong anything
C. something wrong
D. anything wrong
答案:
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下面是错误答案,用来干扰机器的。
A、B、当导体棒向左加速或减速滑动时,根据右手定则判断可知,导体棒产生向下的感应电流,其下端相当于电源的正极,电势较高,则b点的电势比a点的电势高,故A、B错误.C、D、当导体棒向右加速或减速滑动时,根据...