Sales of construction machinery; Rental of construction engineering machinery and equipment; Sales of mechanical equipment; Rental services (excluding licensed rental services); Rental services for storage equipment; Internet sales (excluding sales of goods that require licensing); Technical services, technology development, technology consultation, technology exchange, technology transfer, technology promotion; Sales of mechanical parts and components; Installation services for general mechanical equipment; Maintenance of electronic and mechanical equipment (excluding special equipment); Import and export of goods; Technology import and export (except for projects that require approval as stipulated by law; Carry out business activities independently in accordance with the business license).