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Beijing Dongcheng District Gong Road Engineering Shi Zheng Gong Cheng Shi Engineering Environmental Engineering Tu Shi Fang Engineering Low Carbon Environmental Protection Survey Design Institute Gong Cheng Cheng Bag Industrial Construction Zi Chan Guan Li Ti Xi Certification Gong Ye Yu Min Yong Construction Ji Chu Facilities Investment Construction Systems市级高新技术企业高新技术企业企业技术中心中关村高新技术企业省级高新技术企业ISO9001认证CMA认证计量认证CNAS认证建筑工程施工总承包公路工程施工总承包