单项选择题
Faulty operation of any system is indicated by very definite （）.
A.symptoms
B.samples
C.traces
D.tracks
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相关考题
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单项选择题
The refrigerating agent can （） at low temperature in the evaporator.
A.expand
B.evaporate
C.condense
D.distil -
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 -
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
