12. Spandex: Synthetic fiber, uas yog, cov tub ntxhais ncej, muaj cov yam ntxwv ntawm siab elongation, siab elasticity, thiab zoo acid kuj, alkali tsis kam, lub teeb tsis kam, thiab abrasion kuj. 13. Polypropylene: Polypropylene yog ib lub npe nrog Suav yam ntxwv. Qhov tseeb, nws yuav tsum ...
Nyeem ntxiv