单项选择题
If no gaskets are used in the piping joints of a Freon system, the joints must be（）
A.finished joints
B.welded joints
C.ground joints
D.soldered joints
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相关考题
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单项选择题
If the temperature in the icebox is too high, the trouble could be（）
A.a clogged scale trap
B.air in the system
C.automatic controls not functioning properly
D.insufficient cooling water to the condenser -
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 -
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
