This standard specifies the classification, basic rules, technical requirements, test methods, inspection rules and marking, packa

This standard specifies the factory inspection, type inspection and product acceptance of steel grid structure products. This stan

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This standard specifies the marking, requirements, test methods, inspection rules, and marking, packaging, transportation, and sto

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This code is formulated to improve the technical level of V-shaped folded plate roof design and construction, implement the nation