单选题An electrical device which employs a stationary armature and a rotating electromagnetic field is used aboard ship as a （）.Amagnetic amplifierBship’s service alternatorCthree-wire DC generatorDsaturable core reactor
单选题
An electrical device which employs a stationary armature and a rotating electromagnetic field is used aboard ship as a （）.
A
magnetic amplifier
B
ship’s service alternator
C
three-wire DC generator
D
saturable core reactor
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