Stock Code 002139.SZ Co-Innovating A Smarter Future Basis of preparation The Report is prepared based on the Self-regulatory Guidelines for the Companies Listed on the Shenzhen Stock Exchange No. 1 - Standardized Operation of the Companies Listed on the Main Board and the Self-regulatory Guide for the Companies Listed on the Shenzhen Stock Exchange No. 1 - Business Processing, with reference to the GRI Standards and in conjunction with the actual situation of Topband. The disclosures of indicators in the Re ...