Lub sijhawm hluav taws kub ntawm chav kawm B steel qhov rooj yuav tsum tsis pub tsawg dua 1.0 teev, thiab cov khoom siv kho vajtse siv rau ntawm qhov rooj hluav taws yuav tsum yog cov khoom siv hluav taws xob tiv thaiv hluav taws. Feem ntau, qhov hluav taws kub ntawm qib no feem ntau yog siv rau lub qhov rooj nkag ntawm tsev neeg kho kom zoo nkauj.

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