单项选择题
The frequency of the alternating current generated by a synchronous generator is governed by the speed and the（）
A.full excitation
B.load
C.power factor
D.number of poles
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When two DC generators operate in parallel, they are protected against motorizing by（）
A.blow out coils
B.governor relay
C.under voltage trips
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单项选择题
The correct phase rotation of a three-phase alternator can be checked with a（）
A.dynamometer
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