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英译汉：rotor
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考题
In a modern three-phase A.C. synchronous brushes generator, the excitation winding is on the rotor. That means .A.The generator need not excitation.B.The winding on the rotor is for inputting excitation current.C.There are three phase windings on the rotor.D.The generator has no brushes.
考题
单选题What type of rotor is used in split-phase motors?（）A
DramB
Salient poleC
Squirrel-cageD
Wound-rotor
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