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墙体水平沟槽的留置《砌体工程施工质量验收规范》(GB50203 -2002)第3.0.7条规定 :设计要求的洞口、管道、沟槽应于砌筑时正确
Wall horizontal groove indwelling “Masonry Construction Quality Acceptance Code” (GB50203 -2002) Article 3.0.7 states: the design requirements of the openings, pipes, grooves should be masonry correct