General items: Sales of Category I medical devices; The second category of medical device sales; Marketing of sanitary and single-use medical supplies; Sales of disinfectants (without dangerous chemicals); Medical personnel protective equipment wholesale; Retail of protective equipment for medical personnel; Wholesale of medical masks; Daily masks (non-medical) sales; Sales of labor protection articles; Sales of special labor protection equipment; Sales of needle textiles; Sales of industrial textile products; Rubber products sales; Sales of plastic products; Glass instrument sales; Instrument sales; Sales of experimental analytical instruments; Internet sales (except sales of licensed goods); Wholesale of electronic components; Retail of electronic components; Sales of electronic products; Distribution switch control equipment sales; Smart home consumer device sales; Special equipment repair; General mechanical equipment installation services; Information technology consulting services; Technical service, technology development, technology consultation, technology exchange, technology transfer, technology popularization; Conference and exhibition services; Office services; Information system integration services; Computer and office equipment maintenance (except the items subject to approval according to law, independently carry out business activities according to law with the business license) Permitted items: The third type of medical equipment business; Sales of disinfection equipment (for items subject to approval according to law, business activities can only be carried out after approval by relevant departments, and specific business items shall be subject to approval documents or licenses of relevant departments)