General projects: technical services, technology development, technical advice, technical exchange, technology transfer, technology promotion; metal structure construction; sale of metal products; sale of metal-based composites and ceramics-based materials; sale of metal materials; sale of heat- and sound-proof materials; production of specialized equipment for environmental protection; manufacture of gas, liquid separation and pure equipment subject to legal approval; sale of gas, liquid separation and pure equipment; container repair; container lease services; rental services (without licensing services); repair of metal products; sale of wood products; sale of non-metal-based composite materials; sale of non-ferrous metal materials; sale of synthetic and sound materials; sale of specialized equipment for environmental protection; sale of gas, liquid separation and pure equipment for sale; sale of non-supplied coal-based equipment for sale; sale of non-supplied equipment for sale;...