单项选择题
A.connected load
B.prime mover speed
C.field excitation
D.generators rated voltage
单项选择题 If the resistance of a circuit is cut in half and the applied voltage is kept constant, the current flow will be （）.
单项选择题 Equal power factors on paralleled AC generators are maintained by an automatic （）.
单项选择题 To equalize the power factor of two alternators operating in parallel, the （）