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單項(xiàng)選擇題

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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單項(xiàng)選擇題

（） 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

單項(xiàng)選擇題

（） 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
C.The air conditioning installation
D.The mooring equipment