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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

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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

單項(xiàng)選擇題

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
B.velocity
C.flow rate
D.temperature

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