单项选择题
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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As a general rule, the first troubleshooting action to be taken in checking faulty electric control devices is to （）.
A.draw a one line diagram of the circuitry
B.test all fuses and measure the line voltage
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单项选择题
A circuit breaker differs from a fuse in that a circuit breaker （）.
A.melts and must be replaced
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单项选择题
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A.brushes on a commutator
B.brushes on slip rings
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