An electrical device which employs a stationary armature and a rotating electromagnetic field is used aboard ship as a （）.<br>A:magnetic amplifier<br>B:ship’s service alternator<br>C:three-wire DC generator<br>D:saturable core reactor

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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