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

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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