Manufacturing, processing, and repair of vehicle power supply equipment, electronic ballasts, refrigeration equipment, electrical machinery and apparatus, instruments and meters, fire-fighting equipment, metal cutting and welding equipment, and electronic computer peripheral equipment; Sales of electronic products, communication equipment, metal materials, chemical raw materials (excluding dangerous goods), general mechanical equipment, and office supplies; Electronic technology consulting services; Self-operated and agency import and export of various goods and technologies, except those restricted or prohibited by the state.