In the 1940's the portal frame was appeared, and the light enclosing structure which was composed by the colored contour plate and the cold-formed thin-wall steel purlin was used massively in the 1960's.

  • 四十年代出现了门式刚架结构,六十年代开始大量应用由彩色压型板及冷弯薄壁型钢檩条组成的轻质围护体系。

  • 互联网摘选 2025-01-20 11:39:24

    • 相关例句
    精确
    • 模糊
    • 词首
    • 词尾
    • 词义
    • 例句