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EN 771-3-2011 Specification for masonry units-part 3: Aggregate concrete masonry units(dense and light-weight aggregates)
EN771-3:2003 砌块产品规范.第3部分:混凝土砌块(密实和轻质集料)
EN771-3:2003 Specification for masonry units-part 3: Aggregate concrete masonry units(dense and light-weight aggregates)