Manufacture of building waterproofing membrane products; manufacture of new building materials (excluding hazardous chemicals); manufacture of plastic products; manufacture of new membrane materials; sales of building waterproofing membrane products; sales of building materials; sales of new membrane materials; sales of engineering plastics and synthetic resins; sales of anti-corrosion materials; sales of thermal insulation materials; research and development of new material technologies; technical services, technology development, technical consultation, technology exchange, technology transfer, technology promotion; engineering technical services (excluding planning management, survey, design, and supervision); leasing services (excluding licensed leasing services); non-residential real estate leasing; office equipment leasing services; conference and exhibition services; general cargo warehousing services (excluding projects requiring approval such as hazardous chemicals); road freight transport for general cargo vehicles with a total mass of 4.5 tons or less (excluding online freight and dangerous goods); contracting of foreign projects; landscaping engineering construction; sports venue facility construction; fishing port and fishing boat berth construction; import and export of goods; import and export agency; technology import and export.