Echnical development, technical consultation and technical service of rail transit vehicle parts, auto parts and electronic products; [production and processing: Rail transit vehicle parts, auto parts, hardware and electrical products, electronic products and mechanical and electrical products (excluding special equipment) (not allowed to engage in processing business in this residence)] (only limited to branch operation); Wholesale and retail: Rail transit vehicle parts Auto parts, hardware and electrical, electronic products, office supplies, chemical products (excluding dangerous goods), building materials, iron ore, steel, mechanical and electrical products (excluding cars), mechanical equipment (excluding special equipment), electronic equipment; Import and export of goods and Technology (those prohibited by national laws and regulations shall not be operated; Those restricted by national laws and regulations shall be operated with license) ). (for projects that need to be approved according to law, business activities can only be carried out with the approval of relevant departments. )