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單項(xiàng)選擇題

The saturation temperature of the refrigerant must be （） that required in the evaporator refrigerated space.

A.above
B.below
C.equal to
D.None of the above

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單項(xiàng)選擇題

The function of （） in a refrigeration plant using Freon is to move moisture from all refrigeration system.

A.filter
B.filter drier
C.heat exchanger
D.air cooler

單項(xiàng)選擇題

The boiling and condensation points of refrigerant mainly depend on the （） exerted upon it.

A.temperature
B.density
C.volume
D.pressure