PetroChina Hohhot Branch PetroChina Dalian Petrochemical Branch PetroChina Ningxia Petrochemical Company PetroChina Dushanzi Petrochemical Branch PetroChina Guangxi Petrochemical Branch PetroChina Qingyang Petrochemical Branch PetroChina Changqing Branch China Petroleum Engineering Design Co., Ltd. (CPE) Southwest Branch Shaanxi Shuangyi Petrochemical Co., Ltd. Shenhua Baotou Coal Chemical Co., Ltd. Shaanxi Chemical Construction Engineering Co., Ltd. Chengdu Elp Gas Products Co., Ltd. Sichuan Petrochemical …