General Projects: Technical services, technical development, technical consultation, technical exchange, technology transfer, technology promotion; sales of special equipment for environmental protection; sales of building materials; sales of coatings (excluding hazardous chemicals); sales of chemical products (excluding licensed chemical products); sales of metal products; retail of hardware products; wholesale of hardware products; operation of wires and cables; sales of power electronic components; manufacturing of mechanical and electrical equipment [branch operations]; manufacturing and processing of doors and windows [branch operations]; sales of firefighting equipment; sales of rubber products; sales of plastic products; sales of metal materials; sales of building decoration materials; sales of textiles and raw materials; wholesale of clothing and accessories; building cleaning services; machinery and equipment leasing; leasing of construction engineering machinery and equipment; food sales (only pre-packaged food). (Except for projects subject to approval by law, carry out business activities independently in accordance with the law with a business license) Licensed Projects: Construction engineering. (Projects subject to approval by law can only be carried out after approval by relevant departments, and specific business activities are subject to the approval documents or permits issued by relevant departments)