Beijing Dongcheng District Medical Engineering Purification Engineering Construction Engineering Gases Engineering Clean Engineering Ya Li Pipes Road Gong Cheng An Apparel She Bei An Apparel Jian Zhu An Apparel An Apparel Engineering Hua Gong / Chemistry省级高新技术企业市级高新技术企业高新技术企业ISO9001认证GB/T28001认证GB/T24001认证