A.Reverse current protection
B.Reverse power protection
C.Synchronising device
D.Frequency meter
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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
A.opposite polarity
B.the same polarity
C.negative polarity
D.positive polarity
A.larger and heavier than
B.as much as
C.smaller and lighter than
D.more dangerous than
A.one slip-ring
B.two sliprings
C.three sliprings
D.four sliprings
A.stationary；rotate
B.stationary；stationary
C.rotate；stationary
D.rotate；rotate
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