Manufacturing of metal chains and other metal products; sales of metal chains and other metal products; manufacturing of hardware products; wholesale of hardware products; manufacturing of pneumatic and electric tools; sales of pneumatic and electric tools; sales of rail transit engineering machinery and components; sales of electronic products; sales of metal materials; manufacturing of plastic products; sales of plastic products; retail of daily household appliances; sales of daily groceries Sales of building materials; manufacturing of automobile parts and accessories; sales of automobile decorative products; research and development of automobile parts; wholesale of automobile parts; manufacturing of bicycles; wholesale of bicycles and spare parts; manufacturing of sporting goods and equipment; wholesale of sporting goods and equipment; manufacturing of metal daily necessities; sales of outdoor supplies; manufacturing of agricultural, forestry, animal husbandry and fishery machinery parts; sales of agricultural, forestry, animal husbandry and fishery machinery parts; Manufacturing of rubber products; sales of rubber products; sales of knitted textiles; manufacturing of bags and bags; manufacturing of industrial textile products; sales of bags and bags; Internet sales (except for sales of goods requiring licenses); manufacturing of non-ferrous metal alloys; rolling processing of non-ferrous metals; wood processing; manufacturing of amusement equipment for ordinary open-air playgrounds (excluding large-scale amusement facilities); amusement rides in ordinary open-air playgrounds Equipment sales; metal surface treatment and heat treatment processing; motorcycle spare parts manufacturing; motorcycle and spare parts wholesale; import and export of goods; technology import and export; network technology services; information technology consulting services; technical services, technology development, technical consultation, technology exchange, technology transfer, technology promotion; camera and video production services; (except padlocks and accessories manufacturing).