题目内容

( )regulates the refrigerant flows from the high pressure side of the system to the lowpressure side.

A. Condenser
B. The expansion valve
C. Evaporator
D. Compressor

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The saturation temperature changes with( )

A. the air density
B. the pressure
C. the present atmospheric pressure
D. surrounding temperature

The most infamous greenhouse gas is( )

A. CO2.
B. R134
C. NH.
D. R22

( )is the process of removing heat, and the practical application is to produce or maintaintemperatures below the ambient.

A. Refrigeration
B. Ventilation
Circulation
D. Evaporation

An important consideration in selecting a lubricating oil for use in a refrigeration compressorfor 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

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