Tam sim no nyob rau hauv ntau yam khoom siv, yuav muaj cov khoom xws li alumina ceramic pas nrig.Qhov laj thawj yog vim li cas cov khoom siv no siv rau hauv cov khoom siv yog vim nws muaj kev ua tau zoo heev.Tom qab siv, nws tuaj yeem ua rau tag nrho cov cuab yeej muaj qhov ua tau zoo dua thiab muaj zog.Txhua yam ntawm ind ...