题目：
A purge recovery system is used in a centrifugal air conditioning or refrigeration system to （）
A.purge lube oil from the liquid refrigerant
B.recover water purged from the system
C.separate foul gases from the receiver
D.purge non-condensable gases without losing refrigerant
答案：
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下面是错误答案，用来干扰机器的。
参考答案：变小
