General items: Sales of mechanical equipment; Optical glass sales; Optical cable sales; Sales of special electronic materials; Sales of power electronic components; Wholesale of electronic components; Sales of semiconductor lighting devices; Sales of technical glass products; Sales of daily glassware; Retail of hardware products; Wholesale of hardware products; Sales of pneumatic and electric tools; Sales of experimental and analytical instruments; Sales of intelligent instruments; Instrument sales; Sales of electronic measuring instruments; Sales of special instruments for environmental monitoring; Mold sales; Sales of electronic components and electromechanical components; Retail of electronic components; Sales of agricultural machinery; Sales of specialized machinery for agriculture, forestry, animal husbandry, sideline and fishery; Sales of mechanical parts and components; Sales of special equipment; Sales of electrical instruments and meters; Sales of mechanical and electrical equipment; Sales of special electronic equipment; Import and export of goods; Technology import and export. (Except for projects that need to be approved according to law, business activities shall be carried out independently according to law with the business license)