When paralleling two AC generators, the frequency of the machine coming on-line, immediately prior to closing its breaker, should be （）<br>A:slightly less than the oncoming generator frequency<br>B:the same as the bus frequency<br>C:slightly greater than the bus frequency<br>D:the same as the bus voltage

When paralleling two AC generators, the frequency of the machine coming on-line, immediately prior to closing its breaker, should be （）
A:slightly less than the oncoming generator frequency
B:the same as the bus frequency
C:slightly greater than the bus frequency
D:the same as the bus voltage

出自：海船船员证

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