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【单选题】
分布绕组的感应电动势小于集中绕组的感应电动势的原因是( ）A.
分布的各线圈在空间有位置差，造成各线圈感应电动势不同时出现最大值
B.
C.
分布的各线圈感应电动势有时间相位差，其合成值为相量和
D.
分布的各线圈感应电动势的相量和小于集中的各线圈感应电动势的代数和
E.
F.
以上都对
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