单选题You are attempting to parallel two AC generators, and the syncope pointer is revolving in the fast directionThis indicates that the frequency of the incoming machine is （）.Ahigher than the bus frequencyBlower than the bus frequencyCthe same as the bus frequency but out of phase with itDthe same as the bus frequency and the circuit breaker may be closed at any pointer position
单选题
You are attempting to parallel two AC generators, and the syncope pointer is revolving in the fast directionThis indicates that the frequency of the incoming machine is （）.
A
higher than the bus frequency
B
lower than the bus frequency
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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