单项选择题
In a direct expansion type multi-box refrigeration system, the compressor is set up to cycle on and off by the（）
A.pressurestat
B.high pressure cutout
C.solenoid valve
D.low pressure cutout switch
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相关考题
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单项选择题
The pressure range between the system cut in and cut out pressures in a refrigeration unit is known as（）
A.opposing operational drag
B.pressure distribution
C.differential
D.system purge -
单项选择题
A fluid coil will （）large quantities of heat when it changes state from a liquid to a vapor.
A.release
B.absorb
C.develop
D.regenerate -
单项选择题
Refrigerant entering the compressor of a refrigeration system should be in which of the following conditions?（）
A.Sub-cooled liquid
B.Sub-cooled vapor
C.Superheated vapor
D.Liquid
