
Bs En 771-3:2011/A1 - Specification For Masonry Units - Part 3: Aggregate Concrete Masonry Units (Dense And Lightweight Aggregates)
出版:British Standards Institution

专家解读视频
Bs En 771-3:2011/A1 - Specification For Masonry Units - Part 3: Aggregate Concrete Masonry Units (Dense And Lightweight Aggregates)
出版:British Standards Institution
专家解读视频