Metal ship manufacturing; non-metal ship manufacturing; ship repair; ship manufacturing. General items: sales of household appliances; manufacturing of pneumatic and electric tools; sales of electrical equipment; manufacturing of plastic products; sales of plastic products; wholesale of hardware products; mold manufacturing; manufacturing of special equipment for plastic processing; manufacturing of metal parts for construction; manufacturing of generators and generator sets; sales of wind turbines and parts; manufacturing of special equipment for environmental protection; manufacturing of steam turbines and auxiliary machinery; manufacturing of general equipment (excluding manufacturing of special equipment); manufacturing of motorcycle parts and accessories; manufacturing of water turbines and auxiliary machinery; manufacturing of pumps and vacuum equipment; seawater desalination treatment; marine accessories Manufacturing of sets of equipment; production of Class I medical devices; sales of Class I medical devices; manufacturing of marine engineering equipment; manufacturing of marine engineering platform equipment; engineering and technology research and experimental development; marine engineering equipment research and development; medical research and experimental development; sales of new membrane materials; manufacturing of metal materials; sales of metal materials; sales of new metal functional materials; sales of surface functional materials; technology import and export; import and export of goods; import and export agency; business management consulting; information consulting services (excluding licensing information consulting services); information technology consulting services.