No.25 Shenyang Popularity Ranking No.2 Huanggu District No.53 Liaoning No.1 Dai Processing No.1 Pipes and Fittings No.1 Gas No.1 Water Supply and Drainage Engineering No.1 City Gas No.1 Water Supply and Drainage No.1 Waterproofing Engineering No.1 Waterproofing Technology No.1 Environment Management No.1 Water Supply and Drainage Design No.1 Low Carbon No.1 Polyethylene PE 驰名商标 国家免检产品 名牌产品 企业技术中心 副理事长单位 理事长单位 ISO9001认证 ISO14001认证 OHSAS18001认证