R&D, processing, sales and maintenance of CNC equipment and accessories; R&D, processing, and sales of engraving machines, cutting machines, mechanical equipment, stone processing equipment, special equipment for oil drilling, food processing machinery, and motorcycle accessories; wholesale and retail of mechanical equipment and accessories, building decoration materials, and solar energy equipment; machinery Equipment leasing; wholesale and retail of stone; indoor and outdoor decoration projects; business management consulting; computer software development; import and export of goods (except for the import and export of goods and technologies prohibited by the state or involving administrative approval) and other projects that are not prohibited by laws, regulations, decisions of the State Council, etc. and do not require business licenses.