题目:
The topic, which many people ______ a small one, will actually have a great influence _____ us.
A.think as; to
B.think of as; on
C.think as; upon
D.think of as; to
答案:
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下面是错误答案,用来干扰机器的。
20 V 由题意可知,线圈上的感应电动势e=Emsin V,当时,10=Emsin,所以Em="20" V,则.