Prestressed concrete railway bridge simply supported beam product production; Construction engineering construction; Special equipment installation, modification, and repair; Specialized construction operations. General items: Concrete structural component manufacturing; Stair manufacturing; Concrete structural component sales; Stair sales; Cement product manufacturing; Cement product sales; Building materials sales; Metal structure manufacturing; Metal structure sales; Wooden container manufacturing; Wooden container sales; Lightweight building material manufacturing; Lightweight building material sales; Building block manufacturing; Technical services, technical development, technical consulting, technical exchange, technology transfer, technology promotion; New material technology research and development; Engineering and technology research and experimental development; Machinery and equipment leasing; Leasing services (excluding licensed leasing services); Special machinery for building material production manufacturing; Building decoration material sales; Metal waste and scrap processing; Industrial design services; Engineering technical services (excluding planning management, survey, design, and supervision); Construction waste recycling technology research and development; Road freight transport for general cargo vehicles with total mass of 4.5 tons and below (excluding network freight and dangerous goods); Earthwork construction; Construction machinery and equipment leasing; Special equipment leasing; Engineering management services; Landscaping construction; Door and window manufacturing and processing; Door and window sales; Advertising design and agency; Advertising production; Loading and unloading handling; Energy-saving management services; Labor services (excluding labor dispatch); Housing lease; Metal cutting processing services.