单项选择题
If an air compressor is used to supply compressed air to outlets throughout the engine room and on deck of a vessel, the system is known as the （）.
A.combustion control air system
B.supply air system
C.ships service air system
D.low pressure deck air system
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单项选择题
The sensible heat of air is dependent upon the （）.
A.dry bulb temperature
B.wet bulb temperature
C.saturation temperature
D.water vapor superheat -
单项选择题
Which of the devices listed, when used on an electro-hydraulic steering gear, keeps the movement of the redder closely in step with the steering wheel?（）
A.The follow-up gear
B.The rudder angle indicator
C.The synchronous electric transmitter
D.A rudder angle limit switch -
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Propeller pitch speed minus ship speed divided by the propeller pitch speed is termed （）.
A.apparent slip
B.tree slip
C.pitch
D.propulsive efficiency
