單項(xiàng)選擇題

The refrigerating agent can （） at low temperature in the evaporator.

A.expand
B.evaporate
C.condense
D.distil

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單項(xiàng)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

單項(xiàng)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