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Hlau hluav taws qhov rooj yog lub qhov rooj ncej, lub qhov rooj nplooj pob txha thiab lub qhov rooj nplooj vaj huam sib luag ua los ntawm cov ntaub ntawv hlau. Yog hais tias lub qhov rooj nplooj yog ntim nrog cov ntaub ntawv, nws yog ntim nrog fireproof thiab tshav kub-insulating cov ntaub ntawv uas tsis muaj teeb meem rau tib neeg lub cev.

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