General items: technical research and development of biochemical products; technical services, technical development, technical consultation, technical exchange, technology transfer and technology promotion; production of chemical products (excluding licensed chemical products); sales of chemical products (excluding licensed chemical products); manufacturing of synthetic fiber; sales of synthetic fibers; manufacturing of knitted or crocheted fabrics and their products; sales of knitwear and textiles Sales; clothing manufacturing; clothing retail; rubber products manufacturing; rubber products sales; plastic products manufacturing; plastic products sales; hardware products retail; household appliances manufacturing; household appliances sales; electronic products sales; communication equipment manufacturing; communication equipment sales; mechanical and electrical equipment manufacturing; machinery and equipment sales; the first type of medical equipment production; the first kind of medical devices Sales of machinery; manufacturing of electronic components; retail of electronic components; manufacturing of metal materials; sales of metal materials; manufacturing of heat insulation and sound insulation materials; sales of heat insulation and sound insulation materials; manufacturing of light building materials; sales of light building materials; sales of graphene materials; professional design services; conference and exhibition services; retail of medical masks; production of daily masks (non-medical); daily use Sales of masks (non-medical); retail of protective articles for medical personnel; sales of category II medical devices; retail of cosmetics; production of special labor protection articles; sales of special labor protection articles (except for the items that need to be approved according to law, carry out business activities independently with business license according to law). Licensed items: production of medical masks; production of protective articles for medical personnel (class II medical devices); production of class II medical devices; production of cosmetics; import and export of goods (items that must be approved according to law can be operated only after being approved by relevant departments, and the specific business items shall be subject to the approval results).