3DT printing base material sales and transmission type material product sales; Consumer sales: sales of mobile terminal devices: sales of electronic products; Therefore, the material is supplied to the material sales department, and the equipment is sold by Guodi Tonghua as hot scrap products, as well as silver and powder metallurgy products; Sales of high-quality special steel materials: sales of electrical materials using department stores; sales of electronic specialized equipment; sales of electronic measuring instruments; Rail transit engineering machinery and component sales