Hlau hluav taws qhov rooj raws li qhov hluav taws kub tsis kam, kev ua haujlwm hluav taws tau muab faib ua qib A, B, C. Lub sijhawm hluav taws kub ntawm chav kawm A steel qhov rooj hluav taws yuav tsum tsis pub tsawg tshaj 1.5 teev, lub sijhawm hluav taws kub ntawm chav kawm B steel qhov rooj yuav tsum tsis pub tsawg tshaj 1.0 teev, thiab lub sijhawm hluav taws kub ntawm chav kawm C steel qhov rooj yuav tsum tsis txhob tsawg dua 0.5 teev.

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