18 「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(0), B(5), C(0), D(0), E(0) #2503399