单项选择题

Any electric motor can be constructed to be（）.

A.short proof
B.ground proof
C.explosion proof
D.overload proof

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Current changing in direction and rising and falling in...

单项选择题Current changing in direction and rising and falling in value is （）.

A.AC
B.DC
C.generator
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单项选择题The output voltage of a three-phase alternator is regulated by the （）.

A.AC voltage to the armature
B.AC voltage to the field
C.DC voltage to the armature
D.DC voltage to the field

To repair a small electrical motor that has been submer...

单项选择题To repair a small electrical motor that has been submerged in saltwater, you should （）.

A.wash it with fresh water and apply an external source of heat
B.renew the windings
C.send it ashore to an approved service facility
D.rinse all electrical parts with a carbon tetrachloride cleaning solvent and then blow dry the motor with compressed air

船舶电气与船舶安全

Any electric motor can be constructed to be（）.