No.196 Yizhuang Development Zone Popularity Ranking Beijing No.3 Plumbing Systems No.3 Plumbing Devices Materials No.4 Refractory Materials No.4 Nai Huo No.5 Jian Zhu Jie Gou No.7 Water Supply and Drainage No.7 Water Supply and Drainage Engineering No.7 Water Supply and Drainage Design No.8 Dian Ci Jian Rong No.9 Ya Li Pipes Road No.11 Ya Li Rong Devices No.11 Chemicals Materials 常务理事单位 理事单位 高新技术企业 国家知识产权优势企业 企业技术中心 知识产权示范企业