1.若no為旋轉磁場速度，n為轉子轉速，則三相感應電動機的轉差率計算公式為何？
(A)S = (no＋n) / no
(B)S = (no－n) / n
(C)S = (no－n) / no
(D)S = (no＋n) / n

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統計： A(5), B(11), C(83), D(3), E(0) #1197290