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Beijing Xicheng DistrictNo.15 Environmental Protection ServicesNo.26 Zi Yuan Zong He Li YongNo.28 Industrial Energy SavingNo.28 Energy Performance ContractingNo.29 Wu Hai Chemical ProcessingNo.37 Energy Saving ServicesNo.44 Zi Yuan Hua Li YongNo.59 Qing Jie TechnologyNo.64 Photovoltaic Power Generation Environmental Technology Ke Chi Xu Fa Zhan New EnergyCSC节能认证