单项选择题

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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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

单项选择题

A.mechanical energy
B.heat energy
C.potential energy
D.kinetic head