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建筑施工承插型盘扣式钢管脚手架安全技术标准JGJ/T231-2021 住房和城乡建设部发布著专业科技文轩网

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[正版图书]JGJ/T 231-2021 建筑施工承插型盘扣式钢管脚手架安全技术标准规范

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[正版]正版2021年新版 JGJ/T 231-2021建筑施工承插型盘扣式钢管脚手架安全技术标准施工机械规范代替J

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[正版]建筑施工承插型盘扣式钢管脚手架安全技术标准 JGJ/T 231-2021 备案号J 1128-2021 中华人

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