Hluav Taws-Rated Steel Qhov Rooj

Hluav Taws Kub-Rated Steel lub qhov rooj ua lub luag haujlwm tseem ceeb hauv kev ua kom cov neeg muaj kev nyab xeeb thiab muaj cov khoom puas tsuaj rau cov khoom hluav taws. Daim ntawv lo rau cov neeg tua hluav taws tswj kev kis hluav taws thiab haus luam yeeb ntev txog 3 teev. Qhov rooj hluav taws xob yog qhov cuab yeej hlau yog kev lag luam lwm qhov rooj rau cov ntoo hluav taws, thaum ntau tshaj li 20 feeb ntsuas yog qhov yuav tsum tau ua. Cov hlau yog lub rooj cov khoom siv kom xa 3 teev tua hluav taws.