30.直流電機中,疊繞繞組的並聯電路數為磁極數的幾倍?
(A)1
(B)2
(C)3
(D)4
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統計: A(74), B(66), C(26), D(24), E(0) #1201581
統計: A(74), B(66), C(26), D(24), E(0) #1201581