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單項(xiàng)選擇題

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

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單項(xiàng)選擇題

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

單項(xiàng)選擇題

An important consideration in selecting a lubricating oil for use in a refrigeration compressor is for the oil to （）

A.have a high viscosity index
B.mix readily with refrigerant
C.have a high freezing point
D.have a low pour point