单项选择题
The device, which is installed in the compressor suction line to prevent liquid from entering the compressor when hot gas defrosting, is called a（）
A.re-evaporator
B.receiver
C.dehydrator
D.solenoid
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The humidity of the atmosphere can be determined by the use of the（）
A.anemometer
B.potentiometer
C.manometer
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In a centrifugal Freon refrigeration system, the overall capacity of the system is increased by（）
A.opening more bypass lines
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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
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