单项选择题
A.a clogged scale trap B.air in the system C.automatic controls not functioning properly D.insufficient cooling water to the condenser
Air or noncondensable gas is removed from a refrigerati...
单项选择题Air or noncondensable gas is removed from a refrigeration system by a （）
A.separating chamber B.system of baffles C.purge valve D.vacuum reducing valve
Where are the zinc plates located?（）A.saltwater side of...
单项选择题Where are the zinc plates located?（）
A.saltwater side of the condenser B.refrigerant side of the condenser C.in the evaporator coils D.in the suction strainer
The device used for low-pressure control and high-press...
单项选择题The device used for low-pressure control and high-pressure cutout on a compressor is called a（）
A.cutout B.pressure controller C.controller switch D.cutout switch
