Licensed projects: Construction project construction; Construction labor subcontracting (projects that are subject to approval according to law can only be carried out with the approval of relevant departments. Specific business projects are subject to the approval documents or licenses of relevant departments). General projects: Manufacturing of bearings, gears and transmission parts; Sales of bearings, gears and transmission parts; Manufacturing of special equipment for metallurgy; Sales of special equipment for metallurgy; Manufacturing of special equipment (excluding manufacturing of licensed professional equipment); Manufacturing of general equipment (excluding manufacturing of special equipment)