Air or noncondensable gas is removed from a refrigeration system by a （）<br>A:separating chamber<br>B:system of baffles<br>C:purge valve<br>D:vacuum reducing valve

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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