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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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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
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