Special equipment design; Special equipment manufacturing; Special equipment installation, modification, and repair; Special equipment inspection and testing; Railway transportation infrastructure equipment manufacturing; Road freight transport (excluding dangerous goods); Road dangerous goods transport; Hazardous waste management; Inspection and testing services; Construction engineering construction. General items: Mining machinery manufacturing; Special equipment manufacturing (excluding licensed professional equipment manufacturing); General equipment manufacturing (excluding special equipment manufacturing); Mechanical and electrical equipment manufacturing; Metal chains and other metal products manufacturing; Mechanical equipment research and development; Mechanical equipment leasing; Mechanical equipment sales; Special equipment repair; General equipment repair; General mechanical equipment installation services; Electronic and mechanical equipment maintenance (excluding special equipment); Special equipment sales; Material handling equipment manufacturing; Material handling equipment sales; Forgings and powder metallurgy products manufacturing; Forgings and powder metallurgy products sales; Industrial design services; Bearings, gears, and transmission components manufacturing; Bearings, gears, and transmission components sales; Railway special measurement or inspection instruments manufacturing; Railway locomotive and rolling stock parts manufacturing; Railway transportation auxiliary activities; Loading and unloading handling; New energy original equipment manufacturing; New energy original equipment sales; Water environment pollution prevention services; Environmental protection monitoring; Environmental monitoring special instruments and meters manufacturing; Environmental monitoring special instruments and meters sales; Solid waste treatment; Metal waste and scrap processing; Non-metal waste and scrap processing; Renewable resources sales; Technical services, technical development, technical consulting, technical exchange, technology transfer, and technical promotion; Special chemical product manufacturing (excluding hazardous chemicals); Special chemical product sales (excluding hazardous chemicals); Coating manufacturing (excluding hazardous chemicals); Coating sales (excluding hazardous chemicals); Thermal and sound insulation materials manufacturing; Thermal and sound insulation materials sales; Anti-corrosion material sales; Thermal insulation material sales; Steel and iron smelting; Ferrous metal casting; Enterprise management consulting; Information technology consulting services; Software development; Artificial intelligence application software development; Computer system services; Information system integration services; Advertising production; Advertising publishing; Advertising design and agency; Service consumer robot manufacturing; Service consumer robot sales; Renewable resource recovery (excluding production scrap metal); Production scrap metal recovery; Goods import and export; Technology import and export.