
En 772 Methods Of Test For Masonry Units - Part 20 - Determination Of Flatness Of Faces & Squareness Of Angles & Edges (pren 772-20)
出版:British Standards Institution

专家解读视频
En 772 Methods Of Test For Masonry Units - Part 20 - Determination Of Flatness Of Faces & Squareness Of Angles & Edges (pren 772-20)
出版:British Standards Institution
专家解读视频