Technical development, technical consultation, technical service and technical promotion of computer software Business information consulting services (excluding financial, securities, futures, education, legal and investment consulting); Enterprise management consulting Trade agency Sales of labor protection supplies, office supplies, hardware tools, mechanical and electrical products, chemical products (excluding dangerous chemicals, monitored chemicals and flammable and explosive substances), lubricating oil, mechanical equipment and accessories, and metal products (excluding rare and precious metals); Installation, maintenance and technical services of mechanical and electrical equipment. (Business activities subject to approval in accordance with the law may only be carried out after approval by the relevant authorities. )