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【单选题】
关于感应电动势的正确说法是:A.
导体回路中的感应电动势的大小与穿过回路的磁感应通量成正比
B.
当导体回路所构成的平面与磁场垂直时，平移导体回路不会产生感应电动势
C.
只要导体回路所在处的磁场发生变化，回路中一定产生感应电动势
D.
将导体回路改为绝缘体环，通过环的磁通量发生变化时，环中有感应电动势
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