單項選擇題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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1.單項選擇題（）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
2.單項選擇題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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