Production, processing, and sales: Oil treatment equipment, water treatment equipment, ordinary machinery and accessories, products such as our hair, the most experienced, and if used, the top tier, oil machine equipment and accessories, oil treatment, and water treatment technology research and development; Sales: Water treatment reagents, system equipment, instruments, valves, pressure vessels, heat exchange equipment, frequency conversion energy-saving equipment, engineering machinery, lifting equipment, electrical equipment and accessories, chemical equipment and accessories, five+power supply, tools, energy-saving and environmental protection equipment and accessories: Import and export of goods; Research and development of related technologies and technical services for water conservancy and hydropower: Installation of water conservancy and hydropower equipment, research and development, production, and sales of electric auxiliary equipment (prohibited by national laws and regulations for business operation; Restricted by national laws and regulations for business operation after obtaining a license)*