單項(xiàng)選擇題

Faulty operation of any system is indicated by very definite （）.

A.symptoms
B.samples
C.traces
D.tracks

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單項(xiàng)選擇題

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

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

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

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