Special equipment manufacturing; special equipment installation, modification, and repair; special equipment inspection and testing; railway transportation infrastructure equipment manufacturing; port operations; real estate development and operation; construction engineering survey; construction engineering design; construction engineering construction; construction labor subcontracting; specialized construction operations; highway management and maintenance; building demolition operations (excluding blasting operations); residential interior decoration; river dredging specialized construction operations; water conservancy project construction supervision; water conservancy project quality inspection; water transport engineering supervision. General items: General mechanical equipment installation services; mechanical equipment research and development; motor manufacturing; mechanical and electrical equipment manufacturing; gears, gear reducers, and gearboxes manufacturing; ship leasing; marine engineering equipment manufacturing; offshore wind power related system research and development; solar power generation technical services; mining machinery manufacturing; construction engineering machinery manufacturing; specialized equipment repair; metal structure manufacturing; railway locomotive and rolling stock parts manufacturing; high-speed rail equipment and parts manufacturing; port facility equipment and machinery leasing and maintenance services; new material technology research and development; furnace, kiln, and electric furnace manufacturing; environmental protection special equipment manufacturing; gas, liquid separation and purification equipment manufacturing; coal-fired flue gas desulfurization, denitrification, and dust removal equipment manufacturing; environmental protection monitoring; air pollution control; water pollution control; landscaping construction; foreign contracted projects; municipal facility management; building cleaning services; sports venue facility construction; fire protection technical services; building waterproofing membrane product manufacturing; software development; artificial intelligence basic software development; lighting fixture manufacturing; navigation beacon equipment and related device manufacturing; electrical signal equipment device manufacturing; salvage services; diving and rescue equipment manufacturing; underwater systems and operation equipment manufacturing; water conservancy related consulting services; traffic safety and control special equipment manufacturing; power facility equipment manufacturing; security equipment manufacturing; traffic and public management metal sign manufacturing; advertising production; standardization services; technology import and export; technical services, technical development, technical consulting, technical exchange, technology transfer, and technology promotion; hardware product retail; anti-corrosion material sales; building materials sales.