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CDN refers to the static content of a website distributed to multiple servers so that users can access it nearby to improve the speed. Therefore, CDN is also a method of bandwidth expansion, which can be used to defend against DDOS attacks.张老太太孙媳妇有落了，心里正欢喜，看见黄瓜，便笑着大声招呼道：黄瓜，你哥哥的事定好了。这才是范增最为担忧的问题，要是真的打起来，是他们所承受不起的。CDMA is the English abbreviation of Code Division Multiple Access (CodeDivisionMultipleAccess). It is a brand-new and mature wireless communication technology developed on spread spectrum communication technology, a branch of digital technology. The principle of CDMA technology is based on spread spectrum technology, that is, the information data with a certain signal bandwidth to be transmitted is modulated by a high-speed pseudo-random code with a bandwidth much larger than the signal bandwidth, so that the bandwidth of the original data signal is expanded, then modulated by the carrier wave and sent out.Wang Zhiqin, Vice President of China Information and Communication Research Institute: Judging from the mobile phone itself, the future screen will definitely be larger or a new folding screen. It will drive the development of upstream and downstream industrial chains of terminals such as screens and batteries.CBS已续订《福尔摩斯：基本演绎法》第五季。