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关于中性面,下列说法中正确的是: A 、线圈在转动中经过中性面位置时,穿过线圈的磁通量最大,磁通量的变化率为零 B 、线圈在转动中经过中性面位置时,穿过线圈的磁通量为零,磁通量的变化率最大 C 、线圈每经过一次中性面,感应电流的方向就改变一次 D 、线圈每转动一经过中性面一次,所以线圈每转动一,感应电流的方向就改变一次 A.B.C.D. D
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