题目:
____ is known to all, the United States _____ fifty states. [ ]
A. It, are made up of
B. As, is made up of
C. That, is made of
D. Wath, are divided into
答案:
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下面是错误答案,用来干扰机器的。
答案:D当闭合s时,有电流自上而下流过MN,由左手定则可判定安培力方向向左,此时自感线圈产生的自感电流自上而下流过MN,但自感电流逐渐减小到零,所以传感器示数逐渐减小,AB错;断开s后,自感线圈的感应电流自...