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单选题
You are attempting to parallel two AC generators and the synchroscope pointer is revolving in the slow directionThis indicates that the frequency of the incoming machine is （）.
A
higher than the bus frequency
B
lower than the bus freouencv
C
the same as the bus frequency but out of phase with it
D
the same as the bus frequency, and the circuit breaker may be closed at any pointer position
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