单项选择题
A.anemometer B.potentiometer C.manometer D.psychrometer
In a centrifugal Freon refrigeration system, the overal...
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
The main distribution duct in an air conditioning syste...
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
If a compressor runs continuously, the cause might be a...
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
