Those prohibited by laws, regulations and decisions of the State Council shall not be operated; Where laws, regulations and decisions of the State Council stipulate that a license (examination and approval) shall be granted, the business operation shall be based on the license (examination and approval) document after being approved by the examination and approval authority; Where the laws, regulations and decisions of the State Council stipulate that no license (examination and approval) is required, the market subject shall independently choose to operate. (Sales of high-speed railway equipment and accessories; Manufacturing of forgings and powder metallurgy products; Manufacturing of auto parts and accessories; Sales of forgings and powder metallurgy products; Manufacturing of additive manufacturing equipment; Additive manufacturing; Steel rolling processing; Ferrous metal casting; Nonferrous metal casting; Sales of rail transit engineering machinery and components; Metal cutting processing services; Sales of metal products; Manufacturing of plastic products; Sales of plastic products; Import and export of goods; Technology import Export Automobile decoration products manufacturing; Paper products manufacturing; Paper products sales; Sales of packaging materials and products; Manufacturing of metal cutting and welding equipment; Sales of metal materials; Spray processing; Electrophoretic processing; Mold manufacturing; Hardware products manufacturing; Manufacturing of metal chains and other metal products (for projects that need to be approved according to law, business activities can only be carried out after being approved by relevant departments)