1. Enterprise R&D investment does not meet the requirements: enterprise R&D investment does not meet the requirements of high-tech enterprises, and there is a risk of being disqualified from high-tech enterprises.
2. Illegal sale of commercial housing: For example, high-tech residential area in Yanta District illegally sells commercial housing, which does not meet the national standards, resulting in incomplete five certificates.
Please note that these reasons only represent some possible reasons why high-tech fields cannot obtain certificates. In view of the specific situation, it may be necessary to deeply understand the policies and regulations in this field and the operation of related enterprises in order to make a more accurate judgment.