Cov qhov rooj hluav taws tau muab faib ua steel qhov rooj, qhov rooj hluav taws kub, steel ntoo hluav taws qhov rooj thiab qhov rooj hluav taws ua los ntawm lwm cov ntaub ntawv. Los ntawm qhov kev xav ntawm qhov tseem ceeb ntawm qhov hluav taws kub tsis kam, steel qhov rooj hluav taws zoo dua li lwm yam khoom ntawm tib hom nyob rau hauv cov nqe lus ntawm lawv tus kheej cov qauv thiab cov khoom siv sab hauv. Ntoo hluav taws qhov rooj yeej tsis yog hluav taws kub resistant li steel sawv daws yuav.

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