Cov qhov rooj hluav taws muaj qhov sib txawv: steel, ntoo, steel ntoo, iav qhov rooj. Tus nqi ntawm cov qhov rooj hluav taws yuav raug txiav txim raws li qhov profile, qhov loj me thiab lub sijhawm siv hluav taws kub. Txais tos kom sab laj peb.

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