单项选择题
The instantaneous reduction in voltage of an AC generator, resulting from an increase in load, and prior to the automatic voltage regulator correcting the situation, is called voltage （）.
A.droop
B.drop
C.dip
D.regulation
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Which is a function of the voltage regulators used with AC generators?（）
A.To cut out generators when they are no longer required
B.To cut in additional generators automatically as required
C.To divide the KW load equally between generators operating in parallel
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