Manufacturing and processing of doors and windows; production of labor protection products; plastic surface treatment; manufacturing of sponge products; manufacturing of plastic packaging boxes and containers; manufacturing of plastic products; manufacturing of rubber products; sales of daily necessities; wholesale of stationery; wholesale of sporting goods and equipment; sales of metal materials; sales of civil aviation materials; agriculture Sales of thin films; sales of rubber products; sales of surface functional materials; sales of new film materials; sales of functional glass and new optical materials; sales of high-quality synthetic rubber; sales of high-performance sealing materials; sales of graphene materials; sales of engineering plastics and synthetic resins; sales of high-performance fibers and composite materials ; Sales of metal matrix composite materials and ceramic matrix composite materials; sales of soft magnetic composite materials; sales of machinery and equipment; wholesale of automobile parts and accessories; wholesale of motorcycles and spare parts; wholesale of hardware products; sales of chemical products (excluding licensed chemical products); sales of electrical equipment; sales of metal products; electronic components Parts wholesale; Domestic trade agent; Trade broker; Offshore trade operation; Sales agent; Sales of photovoltaic equipment and components; Wholesale of daily necessities; Sales of daily necessities; Sales of building decoration materials; Sales of leather products; Sales of sealing fillers; Sales of electronic special materials; Sales of electrical machinery and equipment; Electric power Sales of sub-components; sales of software; sales of office equipment consumables; sales of mica products; sales of special equipment for rubber processing; sales of paper products; sales of graphite and carbon products; sales of refractory materials; sales of office supplies; sales of sponge products; sales of fireproof sealing materials; import and export of goods; import and export of technology ; Sales of building materials; sales of electronic products; sales of battery spare parts; sales of special packaging equipment; sales of seals; sales of plastic products; retail of stationery; retail of sporting goods and equipment; retail of motorcycles and spare parts; retail of hardware products; retail of electronic components; sales of anti-corrosion materials; thermal insulation Sales of materials; sales of special chemical products (excluding hazardous chemicals); sales of office equipment; sales of daily masks (non-medical); sales of labor protection products; sales of gardening products; sales of special electronic equipment; sales of electronic components and electromechanical component equipment; sales of special equipment for semiconductor devices; information Technical consulting services; industrial design services; professional design services; graphic design; technical services, technology development, technical consultation, technology exchange, technology transfer, technology promotion; 3D printing services; research and development of electronic special materials; research and development of hardware products; new material technology promotion services; new material technology research and development