General business items are semiconductor discrete device sales; Sales of electronic components and electromechanical components; Sales of electronic products; Research and development of electronic special materials; Sales of advanced power electronic devices; Sales of optoelectronic devices; Sales of power electronic components; Instrument sales; Technical service, technology development, technology consultation, technology exchange, technology transfer, technology dissemination; Mechanical equipment research and development; Distribution switch control equipment research and development; Integrated circuit chip and product sales; Domestic trade agents (except for items subject to approval according to law, independently carry out business activities according to law with business licenses), permitted business items are import and export of goods (projects subject to approval according to law, business activities can be carried out only after approval by relevant departments, specific business projects are approved by relevant departments or licenses