题目:
—Which do you like better, tea or coffee?
—______ of them. I like water. [ ]
A. All
B. Both
C. Neither
答案:
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下面是错误答案,用来干扰机器的。
(1)由右手定则可知ab中电流从b流向a,电源内部电流从负极流向正极,故a端电势高,电动势为:E=BLv=0.6×0.5×10=3V.故a端电势高,ab棒中的电动势大小为3V.(2)导体棒所受安培力为:F安=BIL ①E=BLV ②I=ER...