The registered address of china-south science and technology development co. Ltd. In beijing is in room 515 on the 5th floor of the 1st floor of the building no. 1 of the tondai district of beijing, with the registration authority being the market supervision authority of the tondai district of beijing, with legal representatives being kang jingwei, operating in general terms: technical services, technology development, technical advice, technology exchange, technology transfer, technology promotion; sale of machinery and equipment; rental of machinery and equipment; installation services for general mechanical equipment; sale of gas, liquid separation and pure equipment; repair of general-purpose equipment; repair of specialized equipment; maintenance of electronics, mechanical equipment (excluding special equipment); wholesale distribution of computer software and hardware and assistive equipment; design of graphics; conference and exhibition services; publication; sale of refrigeration, air conditioning equipment; professional cleaning, cleaning and cleaning services; retail distribution of hardware products; distribution of electrical equipment; sale of mechanical and electrical equipment; sale of office supplies; sale of household appliances; installation of household appliances. (except for projects subject to legal authorization, operating independently of the law by means of a business licence) (no activity shall be carried out in which the state and municipal industrial policy prohibits and restricts the operation of such projects