单项选择题

Electrical power is expressed in （）

A.ohms
B.volts
C.amps
D.watts

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A.steel
B.aluminum
C.glass
D.copper

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单项选择题To protect the rotor of a motor disassembled for maintenance or overhaul, it should be（）

A.suspended by wire slings in one comer of the shop
B.wrapped in several layers of heavy paper or carboard
C.supported by flat wood blocks on the workbench
D.returned to the frame as soon as the bearings are removed

When paralleled, AC generators must have the same （）A.f...

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B.number of phases
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船舶电气与船舶安全

Electrical power is expressed in （）