阿摩線上測驗
22. The ______ of the electrical power system are maintained within the prescribed tolerances.
(A) voltage and frequency
(B) current and gates
(C) voltage and torque
(D) frequency and transformation
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統計： A(677), B(79), C(167), D(126), E(0) #3039176
統計： A(677), B(79), C(167), D(126), E(0) #3039176
