Manufacturing of construction engineering machinery; Manufacturing of metal structures; Sales of metal products; Repair of metal products; Research and development of metal products; Sales of construction engineering machinery; Leasing of construction engineering machinery and equipment; Technical services, technology development, technical consultation, technical exchange, technology transfer, technology promotion; Wholesale of computer software and hardware and auxiliary equipment; Sales of mechanical equipment; Sales of electronic special equipment; Sales of environmental protection special equipment; Sales of instruments and meters; Wholesale of auto parts; Wholesale of hardware products; Sales of chemical products (excluding licensed chemical products); Sales of mechanical and electrical equipment; Low-temperature storage (excluding items requiring approval such as hazardous chemicals); General cargo storage services; Leasing of non-residential real estate; Loading, unloading and handling; Domestic freight forwarding; Goods import and export; Technology import and export; Road freight transport of general cargo vehicles with a total mass of 4.5 tons and below (excluding network freight and dangerous goods); Sales of paper products; Sales of office supplies.