單項選擇題

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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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

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

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