- 07
- Mar
24 teev qhov rooj, hluav taws kub tawm qhov rooj nqe, upvc hluav taws tawm qhov rooj
Lub qhov rooj steel fireproof yog lub qhov rooj ncej, lub qhov rooj nplooj ncej thiab lub qhov rooj nplooj vaj huam sib luag ua los ntawm cov ntaub ntawv steel. Lub sijhawm hluav taws kub ntawm chav B steel qhov rooj hluav taws yuav tsum tsis pub tsawg dua 1.0 teev, thiab cov khoom siv kho vajtse siv rau ntawm qhov rooj hluav taws yuav tsum yog cov khoom siv hluav taws kub-resistant.
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