General business items are: Sales of Class I medical devices; Sales of rubber products; R&D of new material technology; Technical service, technical development, technical consultation, technical exchange, technology transfer and technology promotion; Sales of electronic products; Clothing wholesale; Daily masks (non medical) sales. (Except for projects that need to be approved according to law, business activities shall be carried out independently according to law with the business license); General merchandise sales; Sales of knitwear, textiles and raw materials; Sales of household appliances; Sales of metal materials; Sales of plastic products; Sales of bio based materials; Research and development of bio based materials technology; Biomass energy technology services; Sales of new membrane materials; Sales of super materials; Sales of machinery and equipment; Sales of communication equipment; Sales of metal products; Office equipment sales; Sales of biomass liquid fuel production equipment; Sales of household products; Outdoor products sales. (Except for the items that must be approved according to law, the business activities shall be carried out independently according to law with the business license). The permitted business items are: Import and export of goods; Import and export agent. (For projects that need to be approved according to law, business activities can only be carried out with the approval of relevant departments. The specific business projects shall be subject to the approval documents or permits of relevant departments. )