Construction engineering construction; road cargo transportation (excluding dangerous goods). General projects: manufacturing and processing of doors and windows; sales of doors and windows; sales of building materials; wholesale of hardware products; construction of metal door and window projects; foreign contracting projects; technical services, technology development, technical consultation, technology exchange, technology transfer, technology promotion; new material technology research and development; energy-saving management services; manufacturing of technical glass products Sales of technical glass products; retail of auto parts; retail of motorcycles and spare parts; sales of artificial intelligence hardware; sales of new energy prime mover equipment; sales of mining machinery; sales of generators and generator sets; sales of optical communication equipment; wholesale of auto parts; sales of electrical accessories; sales of hydraulic power machinery and components; gold Sales of forming machine tools; sales of mobile terminal equipment; sales of CNC machine tools; sales of lime and gypsum; sales of metal chains and other metal products; sales of automobile decorative supplies; sales of special equipment for packaging; wholesale of motorcycles and spare parts; sales of molding materials for casting; sales of integrated circuits; sales of information security equipment; Retail sales of hardware products; sales of pipeline transportation equipment; sales of material handling equipment; sales of new metal functional materials; wholesale of protective equipment for medical staff; sales of high-speed precision gear transmission devices; sales of non-ferrous metal alloys; sales of pneumatic power machinery and components; sales of fireproof sealing materials; sales of power electronic components; non- Sales of metal mines and products; sales of household appliances; sales of calculator equipment; sales of intelligent warehousing equipment; sales of shoemaking raw and auxiliary materials; sales of intelligent robots; sales of optical instruments; sales of railway transportation equipment; sales of machine tool functional components and accessories; sales of green composite materials for rail transit; computer software, hardware and auxiliary products Wholesale of equipment; wholesale of electronic components; sales of mechanical parts and components; sales of special equipment for oil refining and chemical production; sales of construction machinery; sales of optical cables; sales of integrated circuit chips and products; sales of Internet equipment; sales of painting equipment; sales of superconducting materials; sales of high-performance nonferrous metals and alloy materials Sales of trams; sales of railway transportation infrastructure; sales of lightweight building materials; sales of wind turbines and parts; sales of bearings, gears and transmission parts; sales of refrigeration and air-conditioning equipment; sales of synthetic materials; sales of wind farm related equipment; sales of onshore wind turbines; sales of electronic special materials; communications Sales of equipment; sales of fire-fighting equipment; sales of intelligent power transmission, distribution and control equipment; sales of network equipment; sales of gears, gear reducers and gearboxes; retail of household appliances; sales of metal structures; sales of metal materials; sales of gas compression machinery; sales of molds; sales of pneumatic and electric tools; sales of advanced power electronic devices.