Production and sales of modified automobiles, sanitation and environmental protection special-purpose vehicles; production and sales of environmental protection and sanitation facilities and sanitation vehicle compartments; production and sales of new energy special-purpose complete vehicles (self-made chassis for internal use); sales of automobiles, engineering machinery, engineering equipment, building materials, and steel; recycling and utilization of batteries (excluding lead-acid batteries); sales of battery packs, battery cells, and modules; production and sales of agricultural machinery; production and sales of automotive parts; goods or technology import and export business (excluding goods and technologies subject to licensing or prohibited by the state).