Hnav-resistant Wear-resistant txhais tau tias tiv thaiv kev sib txhuam.Txhais: Nws yog ib yam tshiab ntawm cov khoom siv tshwj xeeb hluav taws xob, sib nqus, kho qhov muag, acoustic, thermal, mechanical, chemical thiab biological functions Taw qhia Muaj ...
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