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)
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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