单项选择题
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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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 -
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Under normal conditions, the quantity of air circulation becomes less and less.What is the reason?（）
A.dirty delivery ducts
B.too much refrigerant
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（）is used in typical marine pattern self-contained unit.
A.a water cooled condenser
B.a slop tank
C.a expansion tank
D.a centrifugal pump
