制冷剂/美r410ar22冷r507a三种巨金冰/r404ar134ar407c龙冷媒化冰

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三花内外平衡螺口热力膨胀阀

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三花内外平衡热力膨胀阀空调冷库

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r404a冷/三媒冷化巨美r407cr134ar507a金冰r22r410a冰制冷剂龙/种