Xov xwm khoom
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Koj paub ntau npaum li cas txog PVC ua npuas ncauj profiles
Thaum PVC ua npuas ncauj profiles tau qhia hauv xyoo 1970, lawv tau hu ua "ntoo ntawm lub neej yav tom ntej," thiab lawv cov tshuaj muaj pes tsawg leeg yog polyvinyl chloride.Vim tias kev siv dav dav ntawm PVC tsis tshua muaj foaming khoom, nws tuaj yeem hloov yuav luag txhua yam khoom siv ntoo.Nyob rau hauv xyoo tas los no, lub t ...Nyeem ntxiv
