Manufacturing of gas and liquid separation and purification equipment; Sales of gas and liquid separation and purification equipment; Manufacturing of environmental protection special equipment; Sales of environmental protection special equipment; Wastewater treatment and recycling; Manufacturing of water quality pollutant monitoring and testing instruments; Sales of water quality pollutant monitoring and testing instruments; Manufacturing of specialized water resources machinery; Manufacturing of environmental monitoring special instruments; Sales of environmental monitoring special instruments; Sales of ecological environment materials; Manufacturing of ecological environment monitoring and testing instruments; Sales of ecological environment monitoring and testing instruments; Installation services for general mechanical equipment; Manufacturing of general equipment (excluding special equipment); Manufacturing of specialized equipment (excluding licensed specialized equipment); Water pollution control; Water environment pollution prevention services; Sales of environmental emergency technical equipment; Research and development of unconventional water source utilization technologies; Processing of mechanical parts and components; Sales of mechanical parts and components; Wholesale of hardware products; Retail of hardware products; Domestic freight forwarding; Road freight transport for vehicles with a total mass of 4.5 tons or less (excluding online freight and dangerous goods); Packaging services for transported goods; Domestic container freight forwarding; Loading and unloading services; Import and export of goods; Import and export of technology; Import and export agency.