General business items: design, production, and sales of general mechanical equipment and accessories; processing and sales of nanomaterials; general mechanical processing, contracting mechanical automation projects, equipment and pipeline installation projects; large-scale production line engineering design, sales of hardware and electrical, electronic and electrical components, chemical raw materials and products (excluding dangerous goods); sales of steel plates, profiles, and steel materials; import and export of goods, and import and export of technology (except for items prohibited by laws and administrative regulations, and projects restricted by laws and administrative regulations can only be operated after obtaining a license).