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單項(xiàng)選擇題

The starting air bottle should be pumped up to maximum pressure by the （） before start of the engine.

A.air compressor
B.refrigeration compressor
C.vacuum pump
D.purifier

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單項(xiàng)選擇題

The process during which liquid containing a reasonable amount of sensible heat at a particular pressure immediately changes into steam after admitted to a chamber at a lower pressure is called （）.

A.boiling off
B.flash evaporation
C.condensation
D.none of the above

單項(xiàng)選擇題

When distilling salt water the cooling water discharging from the distiller is fed back to evaporator as feed water （）.

A.to cut down the amount of cooling water needed
B.to prevent an excess amount of cooling water from being discharged to the bilges
C.to supply hot water to the evaporator for more economical operation
D.None of the above is tree