R&D, production and sales of metal matrix composite materials; R&D, production and sales of aluminum, aluminum alloys and their products; R&D, production and sales of non-ferrous metal powders, wire rods and welding wires (excluding hazardous chemicals); manufacturing and sales of aerospace equipment, rail transit equipment, automobiles, motorcycles, internal combustion engines, compressors, etc.; production and operation of power equipment and equipment; property management; self-operated and agent import and export business of various commodities and technologies (except for commodities and technologies that are restricted by the state or prohibited from import and export)