16. 「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(2), C(0), D(0), E(0) #3941500