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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A.frequency meter
B.voltage regulator
C.governor control
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The frequency of an AC generator is controlled by the （）
A.rheostat
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Capacitance is the property of an electric circuit opposing a change in the （）
A.current in the circuit
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