Sinopec Oilfield Service Corporation at its employee's representative meeting on 2 February 2021 pursuant to the Company Law of People's Republic of China and the articles of association of Sinopec Oilfield Service Corporation. Resolution was passed by the employee's representative meeting that Sun Yongzhuang, Zhang Bailing and Du Guangyi were elected as the employee representative supervisors of the tenth session of the supervisory committee of the Company for a term commencing from 2 February 2021 to the date when the term of the tenth session of the Supervisory Committee expires. The above-mentioned employee representative supervisors shall, together with the four non-employee representative supervisors to be elected at the first extraordinary general meeting of the Company for the year 2021, constitute the tenth session of the Supervisory Committee. Sun in June 2004, he was appointed as the Manager of No.2 Downhole Operation Company of Sinopec Shengli Petroleum Administration Bureau of China Petrochemical Corporation. In June 2008, he was appointed as the General Manager of Dongsheng Jinggong Petroleum Development Group Co. Ltd. of Sinopec Shengli Oilfield Co. Ltd. of China Petroleum & Chemical Corporation; In January 2013, he served as the Deputy General Manager of Sinopec Shengli Oil Engineering Co. Ltd. In December 2018, he was appointed as the General Manager of Sinopec Shengli Oil Engineering Co. Ltd. Since December 2020, he served as Executive Director, Secretary of CPC Committee and General Manager of Sinopec Shengli Oil Engineering Co. Ltd. Since February 2021, he served as the employee representative supervisor of the Company. Zhang since December 2003, he successively served as Director of Dispatching Department, Director of Production and Operation Department and Director of West Sichuan Gas Production Plant of Sinopec Southwest Oil and Gas Branch Company. In July 2011, he was appointed as Vice Chief Engineer and Deputy Manager of Yuanba Project Department of Sinopec Southwest Oil and Gas Branch Company. From August 2012 to November 2020, he served as Deputy General Manager of Sinopec Southwest Oil and Gas Branch Company. In March 2017, he was appointed as Secretary of CPC Committee of Sinopec Southwest Oil Engineering Co. Ltd. In August 2017, he served as Secretary of CPC Committee and Deputy General Manager of Sinopec Southwest Oil Engineering Co. Ltd. In May 2020, he was appointed as Executive Director and Secretary of CPC Committee of Sinopec Southwest Oil Engineering Co. Ltd. Since November 2020, he was appointed as Executive Director and Secretary of CPC Committee of Sinopec Zhongyuan Oil Engineering Co. Ltd. Since February 2021, he was appointed as employee representative supervisor of the Company. Du From December 2001 to June 2017, he served as Deputy Director of Zhongyuan Petroleum Exploration Bureau of China Petrochemical Corporation. In January 2013, he served as Secretary of CPC Committee of Sinopec Zhongyuan Oil Engineering Co. Ltd. In March 2016, he served as Executive Director and General Manager of Sinopec Zhongyuan Oil Engineering Co. Ltd. In June 2017, he served as Executive Director and General Manager of Sinopec Oil Engineering and Construction Corporation. In June 2019, he was appointed as Chairman and Secretary of CPC Committee of Sinopec Oilfield Equipment Corporation. In November 2020, he served as Executive Director and Secretary of CPC Committee of Sinopec Oil Engineering and Construction Corporation. From September 2014 to June 2017, he served as the employee representative supervisor of the Company. From February 2021, he was appointed as the employee representative supervisor of the Company again.