PVC daim nyias nyias yog cov khoom siv membrane nrog dej purification muaj nuj nqi. Nws tuaj yeem tshem tawm cov impurities thiab cov pa phem hauv dej, suav nrog cov khib nyiab pov tseg, macromolecular organic teeb meem thiab qee cov ions, los ntawm kev tshuaj xyuas lub cev thiab tshuaj ntsuam molecular, yog li txhim kho ...
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