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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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單項(xiàng)選擇題

（）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

單項(xiàng)選擇題

Which one is not the component of a typical, marine pattern self-contained unit?（）

A.a centrifugal fan
B.a direct expansion cooler
C.a hermetic compressor
D.a centrifugal pump

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