General business scope: Sales of specialized environmental protection equipment; Mechanical equipment research and development; Mechanical equipment sales: Mechanical and electrical equipment sales: And vacuum sales; Sales of mechanical parts and components; Sales of electronic components and electromechanical equipment; Sales of metal materials; Wholesale of hardware products; Sales of power facilities and equipment; Retail of hardware products; Sales of building materials; Sales of lightweight building materials; Sales of chemical products (excluding licensed chemical products); Domestic trade agency; Technical services, technology development, technology consulting, technology exchange, technology transfer, and technology promotion; Installation services for ordinary mechanical equipment; General equipment repair; Maintenance of electronic and mechanical equipment (excluding special equipment); Operational efficiency evaluation service; Contract Energy Management: Information System Integration Services; Computer system services; Engineering management services; Sales of hydraulic power machinery and components; Sales of construction machinery; Engineering and technical services (excluding planning management, survey, design, and supervision); Sales of fireproof sealing materials; Sales of security equipment; Window sales; Sales of marine engineering equipment: Sales of rail transit engineering machinery and components; Software development; Information technology consulting services; Testing and inspection services for highway and waterway engineering; Bidding and tendering for the sales of gas, liquid separation, and purification equipment; Environmental protection monitoring; Indoor air pollution control. (Except for projects that require approval according to law, conduct business activities independently based on the business license in accordance with the law)