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老人吸了多年无效氧，夜猫上门检测，告知真相后，儿子恍然大悟
通过这个案例说明 1、买机器别图便宜，小巧 2、要坚持吸氧，别偷懒 3、定期检查机器氧浓度是否正常，防止吸入无效氧 更多制氧机知识，可全网搜索，夜猫制氧机
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