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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

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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

單項(xiàng)選擇題

With ducted air conditioning systems, the modern tendency is to use（）

A.central air conditioning system
B.high velocity system
C.low velocity system
D.single duct system

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