Dab tsi yog Ib Qhov Kawg Kaw Hlau Yeeb Nkab

Kaw seem. Cov yeeb nkab steel yog ib yam ntawm cov yeeb nkab steel feem ntau siv, thiab kaw txhais tau hais tias ib qho kawg ntawm cov yeeb nkab steel raug kaw, tsim ib ntu kaw, uas yog hu ua cov yeeb nkab kaw.