What are the top five IDC companies in Henan Province?

Well-known consulting companies in China: Zhuo Yuan, Xinhua Letter, Hampton and Peking University. In addition, Ye Maozhong Planning (Advertising) and Maikete (Marketing Communication Network) are the best market research companies in China: iRearch (a well-known online market research company in China), and DisplaySearch (a well-known foreign market research company) is a core team composed of 29 members, distributed in North America and Asia, providing a full set of valuable market speculation, technical evaluation, investigation, research and analysis. Isuppli is a leading global market research company in the field of electronic manufacturing. IDC (International Data Corporation) is a world-famous market consulting and consulting organization. ) MCG(MCG is an internationally renowned consulting company with many successful cases in the field of market research. ) The famous foreign commercial databases are: DIALOG, DATA_STAR, ORBIT, DUN&BRADS system, etc.