单项选择题
After a ship enters service it is（） for the main bus-bar to be made dead.
A.usually
B.commonly
C.exceptional
D.unavoidably
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（） is a machine by which electrical energy is transformed into mechanical energy.
A.An alternator
B.An electric motor
C.A diesel engine
D.A main switchboard -
单项选择题
（） shall be continuously powered and shall have an automatic changeover to a stand by power supply in case of loss of normal power supply.
A.Cooling system
B.Alarm system
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The liquid flowing in the capillary is such that the difference in （） readings taken before the capillary and after it is related to the oil viscosity.
A.pressure
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