单项选择题

（）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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单项选择题

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

单项选择题

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

单项选择题

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