Assembly, processing, sales and maintenance services of metallurgical power machinery components, spark plugs, sensors, oil filters, diesel filters, air filters, gas filters, generator set control systems, generators, electric starter motors; auto parts, motorcycle parts, generators and accessories, gasoline engines, water pumps, sprayers, dusters, gardens Sales of mechanical equipment and accessories, lubricating oil, quenching oil, machine oil, gear oil, white oil, base oil, antifreeze, electronic products, and steel; mechanical equipment installation, maintenance, and equipment debugging technical services; self-operated and agent import and export of various commodities and technologies (except for commodities and technologies that are restricted by the state or prohibited from import and export).