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單項選擇題

Because the expansion valve is just （） way open, the refrigerant is under low pressure in the evaporator.

A.little
B.few
C.a little
D.a few

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單項選擇題

As the refrigerant passes through the valve orifice, its pressure is reduced and part of the refrigerant turns into （）.

A.liquid
B.oily mixture
C.emulsion
D.vapor

單項選擇題

Freon 12 which is used to produce intense cold is normally a （） when at atmospheric pressure and temperature.

A.liquid
B.gas
C.solid
D.water only