Cov ntaub ntawv dab tsi yogcov khoom sib txhuamua los ntawm?
Peb cov ntaub ntawv sib txhuam yog dab tsi? Lub tuam txhab kev sib txhuam dav dav yuav muab faib ua ib puag ncig cov ntaub ntawv-raws li kev sib txhuam cov ntaub ntawv, ib puag ncig tus phooj ywg roj hmab cork kev sib txhuam cov ntaub ntawv thiab ib puag ncig cov ntaub ntawv sib txhuam. Niaj hnub no peb yuav tham txog ib puag ncig tus phooj ywg roj hmab cork kev sib txhuam cov ntaub ntawv.
Ib puag ncig tus phooj ywg roj hmab cork khoom, lub ntsiab lus ntawm hom kev sib txhuam phaj no yog roj hmab, cork thiab organic fiber, uas tsis muaj asbestos, yog li tus nqi kuj nyob ze rau cov neeg. Cov khoom no muaj qhov zoo ntawm kev sib txhuam coefficient zoo, kub tsis kam, kev sib txhuam tsis kam, siab load, tsis muaj suab nrov, thiab lwm yam, thiab tus nqi ntawm cov ntaub ntawv raw khoom yog pheej yig, yog li cov roj hmab cork kev sib txhuam phaj yog dav siv.
