Licensed items: Accommodation services; catering services (items that must be approved according to law can only be carried out with the approval of relevant departments. Specific business items are subject to the approval documents or licenses of relevant departments). General items: bearing manufacturing; bearing sales; bearings, gears and transmission parts manufacturing; high-speed rail equipment and accessories manufacturing; high-speed rail equipment and accessories sales; mechanical equipment sales; mechanical equipment research and development; general equipment manufacturing (excluding special equipment manufacturing); non-