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

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单项选择题

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

单项选择题

Properties of a good refrigeration oil include（）

A.low wax content
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