R&D, manufacturing and sales of carbon fiber, glass fiber, aramid fiber, quartz fiber and aramid honeycomb core products (except for specially controlled and flammable and explosive dangerous goods); communication system technology development, technical services, technical consultation and technology transfer; integration, operation, installation and maintenance of communication systems (except for specially controlled items stipulated by the state); computers Development, sales and maintenance of software and hardware; import and export of goods and technologies (except goods and technologies restricted and prohibited from import and export by the state); electronic products, metal materials and non-metal materials (except for special controls), engineering machinery, building materials, sports equipment spare parts, automobile and motorcycle accessories; sales of Wujinjiaodian; processing of general machinery spare parts.