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單項選擇題

The boiling and condensation points of a refrigerant depend on the （） exerted upon it.

A.temperature
B.pressure
C.velocity
D.heat

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單項選擇題

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

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

單項選擇題

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

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

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