Hainan Advanced Technology Enterprise Research Association is a provincial organization that can issue certificates (letters) to enterprises that meet advanced technology standards. You can enter "Hainan Hi-tech Enterprise Research Association" or enter www.hnxqh.org to view the details of the company on the webpage. Hainan Bi 'an Culture Communication Co., Ltd. is a company that mainly undertakes scientific and technological exchanges and exhibitions, and has the ability to organize and plan large-scale conferences.
That's all I know. Remember to give me extra points.