国产精品原创永久在线-国产精品原创永久在线观看-国产精品原创在线网址-国产精品原创中文巨作av-国产精品云霸高清中字-国产精品孕妇video视频

Shanghai Chuanding is a high-tech enterprise with R&D, production and marketing, committed to the waste water treatment. After years of techniques study, hollow fiber ultra filtration membrane, original spinning process, MBR membrane modular are developed. Applied in high concentration, difficult waste water treatment, they conform with national discharge ……