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單項選擇題

After passing through the expansion valve the refrigerant should be in the state of （）.

A.vapor
B.liquid
C.solid
D.None of the above is tree

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單項選擇題

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

單項選擇題

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

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