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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1.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
2.單項(xiàng)選擇題The（） only allows for adjustment of temperature in each room by the occupant manually controlling the air volume admitted.
A.central air condition system
B.high velocity system
C.low velocity system
D.single duct system
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