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Beijing Capital Co., Ltd. Yanqing Water Bureau Beijing Drainage Group Co., Ltd. Xi'an Chanba Nature Area Management Committee Hunan Provincial Architectural Design Institute The Seventh Design Institute of Shanghai Municipal Engineering Design Institute BeiJing Yizhuang Economic Development Zone Shenzhen Water Group- Shenzhen Water Investment Co. Ltd. Sichuan Taikang Huanbao Keji Gongcheng Co., Ltd.