单项选择题
The evaporating pressure in R22 vapor compression refrigeration plant should be （） atmospheric.
A.below
B.above
C.equal to
D.much larger than
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相关考题
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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 -
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 -
单项选择题
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
