
Hot rolled steel channels, I and H sections - Dimensions and masses; German and English version prEN 16828:2015
出版:German Institute for Standardisation (Deutsches Institut für Normung)

专家解读视频
Hot rolled steel channels, I and H sections - Dimensions and masses; German and English version prEN 16828:2015
出版:German Institute for Standardisation (Deutsches Institut für Normung)
专家解读视频