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Provide effective basic qualifications for enterprises. It is a business license, tax registration certificate, organization code certificate, bank account opening permit and unit vector quality management system certificate. Gong Hu response units should fill in the "qualification certification application form". The material supplier's access permit is that Worm Valley is managed by the headquarters, and the supply efficiency of wholly-owned subsidiaries and directly affiliated enterprises and institutions of the group company is the same here as here. Within the permitted product range, online supply can be provided to China Petroleum and Natural Gas Group Company.