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&On February 9, 2020, Doha company of the group successfully passed the ISO management system certification and obtained the corresponding certificates. &This audit focuses on six departments of Doha company, namely, operation Department, procurement department, finance department, personnel department, production safety department and quality technology department, and reviews the quality, safety and other aspects of the construction site. The audit team conducted a comprehensive and in-depth audit and evaluation of the company's management system through discussion with the company's management, construction site inspection and data verification, and agreed that the operation of the Doha company's management system met the certification standards and passed the certification.