Lub qhov rooj hluav taws kub yog qhov ruaj khov dua li lub qhov rooj ntoo hluav taws, thiab tag nrho cov khoom siv steel hlau tsis yooj yim rau kev puas tsuaj los ntawm tib neeg. Lub qhov rooj steel fireproof tuaj yeem sau nrog ntau yam khoom siv hluav taws xob, uas muaj qhov hluav taws kub zoo thiab tiv thaiv kev haus luam yeeb, thiab tseem muaj lub suab rwb thaiv tsev zoo heev.

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