Sales of refractory materials; Sales of new ceramic materials; Sales of building materials; Sales of building decoration materials; Sales of metal materials; Sales of special metallurgical equipment; Sales of mechanical and electrical equipment; Sales of non-metallic minerals and products; Sales of special chemical products (excluding hazardous chemicals); Sales of graphite and carbon products; Sales of daily glass products; Sales of technical glass products; Sales of chemical products (excluding licensed chemical products); Sales of mechanical equipment; General equipment repair; Industrial engineering design services; Special equipment repair; Earth-rock engineering construction; Technical service, technical development, technical consultation, technical exchange, technology transfer and technology promotion; Enterprise management consulting; Information consulting services (excluding licensing information consulting services); Import and export of goods; Technology import and export