Residential interior decoration; construction engineering construction; specialized construction operations. General items: manufacture of doors and windows; sales of doors and windows; construction of metal doors and windows; landscaping engineering construction; construction of sports venue facilities; advertising production; spray coating processing; manufacture of hardware products; manufacture of metal structures; manufacture of metal accessories for construction; metal surface treatment and heat treatment processing; manufacture of building decoration, water supply and drainage pipe fittings, and other metal products for construction; manufacture of metal signs for traffic and public management; production of furniture parts; leasing of construction engineering machinery and equipment; sales of building materials (excluding sand and gravel); sales of building decoration materials (excluding sand and gravel); sales of office equipment; sales of internet equipment; professional design services; road freight transport for ordinary cargo vehicles with a total mass of 4.5 tons or less (excluding online freight and dangerous goods).