Sales of electronic products: office equipment sales; Office supplies sales; Retail of medical masks; Wholesale of medical masks; Sales of daily masks (non-medical); General merchandise sales; Clothing retail: clothing wholesale: shoe and hat retail; Shoes and hats wholesale: leather products sales; Toy sales; Daily necessities sales; Cosmetics retail; Cosmetics wholesale: audio equipment sales; Retail of computer hardware, software and ancillary equipment; Wholesale of computer hardware, software and auxiliary equipment; Technical service, technology development, technology consultation, technology exchange, technology transfer, technology popularization; Enterprise management consulting; Conference and exhibition services; Advertising design and agency; Advertising release; Advertising production; Housing rental; Security equipment sales; Digital video surveillance system sales;Sales of arts and crafts and ceremonial articles (except ivory and its products); Advertising design and agency; Advertising release; Advertising production; Housing rental: security equipment sales; Digital video surveillance system sales; Security system monitoring services; Import and export of goods; Technology import and export; Out of the