单选题To parallel an incoming machine to a running machine therefore it is necessary to ensure firstly that （）.Atwo frequencies must be brought into phaseBthe incoming machine accepts a small amount of loadCthe running machine must be unloadDboth voltages are equal
单选题
To parallel an incoming machine to a running machine therefore it is necessary to ensure firstly that （）.
A
two frequencies must be brought into phase
B
the incoming machine accepts a small amount of load
C
the running machine must be unload
D
both voltages are equal
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