Yana nufin cewa manyan mambobi masu ɗaukar nauyi sun ƙunshi ƙarfe.Ya hada da tushe tsarin karfe, karfe ginshiƙi, karfe katako, karfe rufin truss (zamanin na bitar ne in mun gwada da girma, wanda shi ne m karfe tsarin rufin truss), karfe rufin, kuma a lokaci guda, bango na St. .
Kara karantawa