单项选择题
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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相关考题
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单项选择题
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 -
单项选择题
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 -
单项选择题
The quantity of cooled air delivered by an air conditioning unit should （） the sum of the quantity of air re-circulated to the unit and the quantity mechanically exhausted.
A.balance
B.not balance
C.be more than
D.be less than
