1. academic platform high-strength bolt connection pairs and steel structure welding nails are mainly used for frictional connections of various steel structures such as railway bridges, highway bridges, large industrial factories, high-rise and super-high-rise buildings, power plant construction, airport hangars, exhibition centers, expo centers, gymnasiums, large-span civil buildings, tower mast structures and other steel structures, and anti-shears, buried parts and anchors for various structures in construction projects. 1 hangzhou haohe bolt co., ltd. 30 concealed duct

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