單項(xiàng)選擇題

If plastic film insulation becomes damaged in air conditioning system, （） may form within the film.

A.evaporation
B.condensation
C.liquefies
D.vaporization

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單項(xiàng)選擇題

Under tropical conditions, control valves have fully opened, but the room still hot.What measures can be taken in such a case?（）

A.Keep the plant running all time
B.Start another blower
C.Increase the ratio of circulated to fresh air
D.Reduce the seawater flow to the condenser

單項(xiàng)選擇題

Under normal conditions, the quantity of air circulation becomes less and less.What is the reason?（）

A.dirty delivery ducts
B.too much refrigerant
C.the fouling filters
D.high temperature outside

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