Kapangidwe ka ulusi wochita kupanga kumaphatikizanso izi: 1. Sankhani zida: Zida zazikulu zopangira ulusi wopangira zimakhala ndi ulusi wopangira (monga polyethylene, polypropylene, polyester, nayiloni), utomoni wopangira, anti-ultraviolet agents, ndi tinthu tating'onoting'ono. . Wapamwamba...
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