题目内容
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提问人:网友lynn0326
发布时间:2022-01-06
[主观题]
In a modern three-phase A.C. synchronous brushes generator, the excitation winding is on t
he 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.
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