Trade brokerage; Internet sales (except for the sale of goods requiring license); Internet equipment sales; Sales of knitwear and raw materials; Knitwear sales; Metal processing machinery manufacturing; Sewing machinery manufacturing; Manufacturing of mechanical and electrical equipment; Manufacturing of cultural and office equipment; Manufacturing of special packaging equipment; General equipment repair; Repair of special equipment; Computer and office equipment maintenance; Research and development of mechanical equipment; Machinery and equipment leasing; Professional cleaning, cleaning and disinfection services; Sales of mechanical equipment; Sales of office equipment; Sales of packaging materials and products; Sales of special packaging equipment; Sales of mechanical parts and components; Auto parts wholesale; Wholesale of hardware products; Domestic trade agency; Daily mask (non-medical) production; ; Technology import and export; Import and export of goods