General projects: Technical services, technology development, technology consulting, technology exchange, technology transfer, technology promotion; Sales of building materials; Sales of construction machinery; Sales of metal structures; Sales of building blocks; Import and export of goods; Technology import and export. (Except for projects that require approval according to law, business activities can be carried out independently based on the business license in accordance with the law) Licensed project: Construction project construction; Construction project design; Professional construction work. (For projects that require approval by law, business activities can only be carried out after approval by relevant departments. The specific business projects shall be subject to the approval documents or licenses issued by the relevant departments. )