Special equipment manufacturing; special equipment design; special equipment inspection and testing; inspection and testing services; Class II medical device production; labor dispatch services. General items: sales of special equipment; manufacturing of general equipment (excluding manufacturing of special equipment); sales of second-category medical devices; sales of metal materials; sales of building materials; sales of mechanical equipment; research and development of metal products; sales of metal products; metal structure manufacturing; sales of metal structures; metal forming machine tool manufacturing; metal forming machine tool sales; metal cutting processing services; mechanical equipment research and development; mechanical parts and component processing; mechanical parts and components sales; metal processing machinery manufacturing; general cargo warehousing services (excluding dangerous chemicals and other items that require license approval); cargo incoming Export; sales of station hydrogenation and hydrogen storage facilities; research and development of automobile parts; manufacturing of automobile parts and accessories; research and development of motorcycles and parts; wholesale of automobile parts; retail of automobile parts; wholesale of motorcycles and spare parts; retail of motorcycles and spare parts; sales of special ceramic products; daily-use ceramics Sales of porcelain products; labor services (excluding labor dispatch); parking lot services; production: gas cylinders; sales: gas cylinders and their raw materials, accessories and testing equipment, gas storage special containers, cluster devices, accumulators, marine parts; corporate marketing planning; goods and technology import and export business.