Technical services, technology development, technical consultation, technology exchange, technology transfer, technology promotion; sales of chemical products (excluding licensed chemical products); sales of rubber products; sales of plastic products; sales of needle textiles; retail of auto parts and accessories; wholesale of auto parts and accessories; retail of motorcycles and spare parts; wholesale of motorcycles and spare parts; import and export of goods; import and export of technology; sales of doors and windows; sales of artificial panels; sales of building materials; construction Sales of construction and decoration materials; sales of tires; sales of special chemical products (excluding hazardous chemicals); sales of molds; sales of wire ropes and their products; sales of machinery and equipment; sales of metal structures; sales of metal materials; sales of metal products; sales of new metal functional materials; sales of steel products for construction; sales of metal accessories for construction; sales of lightweight building materials; sales of awnings; sales of asbestos cement products; sales of furniture spare parts.