单项选择题What is the substance called which can readily be converted from a liquid into a vapor, and also from a vapor into liquid with a reasonably narrow range of pressure?()

A.Refrigerator
B.Refrigerant
C.Cooling medium
D.Brine


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1.单项选择题In a refrigeration plant the () need defrosting.

A.fan
B.compressor
C.condenser
D.evaporator

2.单项选择题Hot gas defrosting uses the hot gas from () to defrost the evaporator.

A.starting air bottles
B.diesel engines
C.boilers
D.refrigeration compressors

4.单项选择题The primary task of the compressed air system is to deliver the starting air necessary for ()

A.starting the ME
B.starting the emergency electric alternator
C.driving the main turbine
D.driving the turbocharger

5.单项选择题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

7.单项选择题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

8.单项选择题When distilling sea water the cooling water discharging from the distiller is fed back to evaporator as feed water ().

A.to decrease scale formation
B.for better cooling effect
C.for more economical purpose
D.to raise vacuum

9.单项选择题In a vacuum boiling evaporator, the fresh water generated is pumped out by ().

A.a brine pump
B.an air ejector
C.a feed water pump
D.a condensate pump

10.单项选择题With a vacuum boiling evaporator, the remainder of sea water fed to the evaporator is pumped out by ().

A.a brine pump
B.an air ejector
C.a feed pump
D.distillate pump