Each of the BOCA National Codes is completely updated and published in a new edition every three years. Code change activity is conducted annually within each three-year edition cycle. The first and second year’s approved changes are published in supple
BOCA CHAPTER 22 NBC-1993由国际建筑标准管理员与官员协会(美国) US-BOCA 发布于 1993-01-01。
BOCA CHAPTER 22 NBC-1993 在中国标准分类中归属于: H40 钢铁产品综合,在国际标准分类中归属于: 77.140.01 钢铁产品综合。
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