Manufacturing and sales of electric heat tracing systems, electric floor heating systems, electric heaters, explosion-proof distribution cabinets and electrical control equipment, cable trays, water pump valves and flanges, laboratory counter cabinets (excluding wood products), purification systems, ventilation systems, air conditioning equipment, instrument system complete equipment, wires and cables, temperature instruments, thermal instruments, flow instruments, pressure instruments, liquid level instruments; processing and sales of copper, copper rods, copper wires, and aluminum products; research and development of copper materials, transfer of technical achievements; development, production, sales, and services of plastic pellets, modified plastics, new materials and their products; design, installation, technical services, repair, and maintenance of electric heat tracing system engineering; sales of glass instruments; non-financial policy-related investment information consulting services; research, development, assembly, manufacturing, processing, and sales of vehicle digital multimedia combination machines, vehicle dynamic monitoring and management equipment, intelligent vehicle-mounted equipment, vehicle radar, automotive parts, and automotive electronic equipment and software products; computer software development and information consulting services; office supplies cleaning services; planting of grains and trees; wholesale and retail of clothing and household appliances; car rental services; self-operated and agency import and export of various goods and technologies (excluding goods and technologies restricted or prohibited by the state).