
Clay Masonry Units - Part 1: Solid Units And Vertically Perforated Units Of Bulk Density Classes >= 1.2
出版:German Institute for Standardisation (Deutsches Institut für Normung)

专家解读视频
Clay Masonry Units - Part 1: Solid Units And Vertically Perforated Units Of Bulk Density Classes >= 1.2
出版:German Institute for Standardisation (Deutsches Institut für Normung)
专家解读视频