1, government agency inquiry: Inquire through government agencies such as the employment and social security department and the industrial and commercial administration department, call relevant local departments, consult the specific process and requirements of qualification inquiry, and learn about the qualification information of enterprises beyond the first level, the first level, the second level and the third level.
2. Search engine query: use Internet search engines, such as Google and Baidu, and enter relevant qualification grade keywords in the search box.