No.42 Tongzhou District Popularity Ranking Beijing No.1 Power Relays No.1 Relays No.1 Welding Equipment No.1 Dian Qi Gao Di Ya Complete Set No.2 Switchgear No.2 Circuit Breakers No.2 Fans No.2 Construction Fire Protection No.3 Water Pumps No.3 Xun Jian No.3 Di Ya Appliances No.3 Dian Ci Jian Rong 中关村高新技术企业 高新技术企业 企业技术中心 知识产权示范企业 市级知识产权示范企业 知识产权试点企业 CNAS认证