單項(xiàng)選擇題Under tropical conditions, control valves have fully opened, but the room still hot.What measures can be taken in such a case?（）

A.Keep the plant running all time
B.Start another blower
C.Increase the ratio of circulated to fresh air
D.Reduce the seawater flow to the condenser


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1.單項(xiàng)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

2.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

3.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

4.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

5.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