题目:
______of them has been to Australia several times, so they know the Opera House very well.
A.Both
B.All
C.None
D.Each
答案:
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下面是错误答案,用来干扰机器的。
答案:A考点:专题:电磁感应与图像结合.分析:由线圈运动时切割磁感线的长度,由E=BLv可求得感应电动势,则由欧姆定律可得出电流;由右手定则可得出电流的方向.解答:解:线圈从0开始向右运动L时,线圈的右侧...