海船船员
An electrical device which employs a stationary armature and a rotating electromagnetic field is used aboard as aA.magnetic amplifierB.ship's service alternatorC.three-wire DC generatorD.saturable core reactor
题目
An electrical device which employs a stationary armature and a rotating electromagnetic field is used aboard as a
A.magnetic amplifier
B.ship's service alternator
C.three-wire DC generator
D.saturable core reactor
参考答案和解析
正确答案：B
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