Qualification certificate
Qualification certification
2018 China Global Engineering Commendation Letter
2018 Daqing Petrochemical Commendation Letter
2018 China National Petroleum Daqing Refining and Chemical Commendation Letter
2019 China National Petroleum North China Petrochemical Commendation Letter
2015 China National Petroleum Jilin Branch Thank You Letter
Thank you letter from Sinopec Tianjin Branch in 2009
Thank you letter from Zhong'an United Coal Chemical in 2022
2023 China Petroleum Refining and Chemical Thank You Letter
2017 CNOOC Huizhou Petrochemical Thank You Letter
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