單項(xiàng)選擇題

The humidity of the atmosphere can be determined by the use of the（）

A.anemometer
B.potentiometer
C.manometer
D.psychrometer

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單項(xiàng)選擇題

In a centrifugal Freon refrigeration system, the overall capacity of the system is increased by（）

A.opening more bypass lines
B.opening additional expansion valves
C.adding refrigerant
D.speeding up the machine

單項(xiàng)選擇題

The main distribution duct in an air conditioning system which contains the cooling coils and filters is called the（）

A.manifold
B.condenser
C.chamber
D.plenum