General Projects: R & D of electronic special materials; sales of advanced power electronic devices; retail of electronic components; sales of optoelectronic devices; sales of electronic special equipment; sales of electronic special materials; sales of electronic vacuum devices; Sales of electronic components and electromechanical components; sales of electronic measuring instruments; sales of power electronic components; sales of electronic products; sales of instruments; sales of metal products; sales of office equipment; Hydraulic and pneumatic components and systems sales; high-speed precision gear transmission sales