4 「變頻調速」之英文名稱為下列何者？
(A) Speed Regulation by Variate Torque
(B) Speed Regulation by Frequency Variation
(C) Speed Regulation by Constant Power
(D) Speed Regulation by Pole Changing

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統計： A(3), B(16), C(3), D(1), E(0) #2159165