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冷库压缩机多久更换一次冷冻油有没必要保养
小型冷库压缩机，用得比较多的压缩机有半封闭活塞式，和全封闭涡旋式。不少中小型冷库机组，从来没有保养过，一直用到烧机，或用到报废，压缩机也没有换过油，那么压缩机需要保养更换冷冻油吗
冷库维修保养18/71
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