美利体育登录入口官网:LST EN 1090-4:2018
与钢和铝结构相关的工作 第4部分:适用于冷成型钢结构和冷成型构造的屋頂、天花板、地板和牆壁的技術要求
Execution of steel structures and aluminium structures - Part 4: Technical requirements for cold-formed structural steel elements and cold-formed structures for roof, ceiling, floor and wall applications