线圈产生感生电动势的大小正比于通过线圈的磁通量的大小。
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法国尚博城堡著名的双螺旋结构楼梯,出自哪位大师的设计?()
A. 罗丹
B. 勒诺依
C. 达芬奇
时速350公里42号道岔,直线尖轨距尖端4014mm处尖轨降低值()mm。
A. 0
B. 4
C. 14
D. 23
There is actually an overlap of()ocean regions somewhere in Western European Waters.
A. as many as three
B. more than two
C. less than two
D. up to four