单项选择题
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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相关考题
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单项选择题
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 -
单项选择题
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 -
单项选择题
If a compressor runs continuously, the cause might be a（）
A.defective thermal bulb
B.clogged scale trap
C.stuck high-pressure switch
D.stuck low-pressure switch
