4.若no 為同步速率，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

答案：登入後查看
統計： A(16), B(45), C(258), D(18), E(0) #580771