Engineering technical services (excluding planning management, survey, design, and supervision), Oil and gas technical services, Mechanical equipment research and development, Petroleum product sales (excluding hazardous chemicals), Petroleum drilling and production special equipment sales, Technical services, technical development, technical consulting, technical exchange, technology transfer, and technical promotion, New material technology research and development, Industrial engineering design services, Metallurgical special equipment sales, Engineering and technical research and experimental development, Wire and cable operations, Power generation technical services, Environmental protection consulting services, Resource recycling service technical consulting, Metal packaging containers and materials sales, Pipeline transport equipment sales, Land pipeline transport, General mechanical equipment installation services, Hardware product research and development, Hardware product retail, Engineering management services, Software development, Artificial intelligence application software development, Digital technical services, Engineering and technical research and experimental development (excluding human stem cells, gene diagnosis and treatment technology development and application, and rare and precious优良 varieties unique to China), Wind power generation technical services, New material technology promotion services, Environmental protection special equipment sales, Power distribution switchgear equipment sales, Building material sales, Earthwork construction, Landscape engineering construction, Metal door and window engineering construction, Sports venue engineering construction, General cargo warehousing services (excluding hazardous chemicals and other items requiring licensing), Road freight transport station operations, Domestic cargo transport agency, Warehousing equipment leasing services, Supply chain management services, Special equipment sales, Total mass 4.5 tons and below ordinary freight vehicle road freight transport (excluding network freight and dangerous goods), Information consulting services (excluding licensed information consulting services), Loading and unloading handling, Packaging services, Technology import and export, Foreign contracted projects, General parts manufacturing. Licensed items: Construction engineering supervision, Construction engineering construction, Installation, repair, and testing of transmission, power supply, and power receiving facilities, Power generation business, transmission business, and power supply (distribution) business, Electrical installation services, Construction engineering design, Special equipment design, Building intelligent system design, Construction professional operations, Cultural relic protection engineering construction, Stage engineering construction, River dredging professional operations, Construction labor subcontracting, Urban distribution transport services (excluding dangerous goods), Special equipment manufacturing, Special equipment installation, modification, and repair.