单项选择题
The pressure range between the system cut in and cut out pressures in a refrigeration unit is known as（）
A.opposing operational drag
B.pressure distribution
C.differential
D.system purge
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相关考题
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单项选择题
A fluid coil will （）large quantities of heat when it changes state from a liquid to a vapor.
A.release
B.absorb
C.develop
D.regenerate -
单项选择题
Refrigerant entering the compressor of a refrigeration system should be in which of the following conditions?（）
A.Sub-cooled liquid
B.Sub-cooled vapor
C.Superheated vapor
D.Liquid -
单项选择题
The heat removed from the refrigerant in the condenser of a refrigeration plant is the （）
A.latent heat of expansion
B.sensible heat of condensation
C.heat of compression
D.all of the above
