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單項選擇題

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

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單項選擇題

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

單項選擇題

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

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