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fire-rated qhov rooj, hluav taws kub retarded qhov rooj, hluav taws kub resistant li qhov rooj
Chav tsev hluav taws qhov rooj yog siv los tiv thaiv peb tus kheej kev nyab xeeb, tiv thaiv kev sib kis ntawm hluav taws, thiab muab sijhawm rau cov neeg tua hluav taws tuaj tua hluav taws.
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