单项选择题

Complete maintenance of electrical motors should include periodic checks for machine （）

A.vibration
B.watertight integrity
C.speed droop
D.reactive power

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单项选择题

A.frequency meter
B.voltage regulator
C.governor control
D.sychroscope switch

单项选择题

A.rheostat
B.governor
C.exciter
D.capacitor

单项选择题

A.current in the circuit
B.voltage in the circuit
C.inductance in the circuit
D.resistance in the circuit