Prior to closing the breaker when paralleling two AC generators, the recommended practice is to have the frequency of the incoming machine （）<br>A:slightly less than the line frequency<br>B:the same as the line frequency<br>C:slightly greater than the line frequency<br>D:All of the above

Prior to closing the breaker when paralleling two AC generators, the recommended practice is to have the frequency of the incoming machine （）
A:slightly less than the line frequency
B:the same as the line frequency
C:slightly greater than the line frequency
D:All of the above

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