单项选择题
A.opposing operational drag B.pressure distribution C.differential D.system purge
A fluid coil will （）large quantities of heat when it ch...
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
Refrigerant entering the compressor of a refrigeration ...
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
The heat removed from the refrigerant in the condenser ...
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
