General equipment manufacturing (excluding special equipment manufacturing); sales of mechanical equipment; processing of mechanical parts and components; sales of mechanical parts and components; manufacturing of machine tool functional parts and accessories; sales of machine tool functional parts and accessories; sales of hydraulic power machinery and components; sales of drawing, calculation and measuring instruments; sales of cutting tools; sales of industrial automatic control system devices; software sales; software development; sales of metal products; plastics Sales of products; sales of rubber products; sales of refrigeration and air-conditioning equipment; retail of auto parts and accessories; wholesale of auto parts and accessories; retail of motorcycles and spare parts; wholesale of motorcycles and spare parts; repair of general equipment; repair of special equipment; Internet sales (except for the sale of goods requiring licenses); import and export of goods; import and export of technology; technical services, technology development, technical consultation, technology exchange, technology transfer, and technology promotion.