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In the process of SSL handshake, no matter whether the data transmitted by the client is valid or not, the server needs to spend more CPU resources to decrypt and verify the validity of the data. Attackers can use this feature to carry out flood attacks.　　最后在FBI探员的帮助下，詹妮弗成功地逃脱了昏迷杀手的大脑，同时她也获知了最后幸存女孩的下落。他们找到那个女孩并将变态杀手绳之于法。徐风原地顿了几秒，推着车转身跟上，俩人保持了前后两步的距离，径直走到收银台前。The next four patterns, including this pattern, are all the relationships between classes and do not involve inheritance. When learning, you should remember induction and the diagram at the beginning of this article. The observer mode is well understood, similar to email subscription and RSS subscription. When we browse some blogs or wikis, we often see RSS icons. This means that when you subscribe to the article, you will be notified in time if there are subsequent updates. In fact, in a nutshell, when an object changes, other objects that depend on the object will be notified and will change with it! Objects are a one-to-many relationship. Let's look at the diagram first:Death is the ultimate powerlessnessIt is so simple that there are some old but neat books in it, mostly children's books, which can be taken and placed at any time for children in need. There is an old Chinese saying: "Don't do it with small evil, don't do it with small good". You understand the truth, but you still need to pay attention to how to do it.The number is small and unusual. In front of the tens of billions of express deliveries each year, the more than 10 million green express packages put in are really a drop in the bucket. However, for express delivery companies, the cost of large-scale promotion is beyond their affordability. Niu Zhijing, head of Cainiao Green Action, said: "Can consumers be willing to bear a little of these costs, can our businesses be willing to bear a little, and can our government encourage some?" Yang Daqing, a special researcher of the China Logistics Association, said: "If we achieve a unified standard through the whole chain, we will reduce the cost pressure brought by a single enterprise in a single link."