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Chu can also see clearly that the reason is that there are too many of them. Let's describe them this way-it looks like a dark cloud rising out of thin air in the rainforest. "Zhang Xiaobo said.这在现代中学生都懂的知识，像打火机原理一样简单的东西，对古人来说却算的上一次技术飞跃了。The principle is that syn messages are first responded to syn_ack by DDOS protection system. With a specific sequence number (recorded as a cookie). The real client returns an ack and the Acknowledge number is cookie+1. The fake client will not respond. In this way, we can know that the clients corresponding to those IP are real and add the real client IP to the white list. The next access passes directly, while other forged syn messages are intercepted. The following is a schematic diagram of protection:?尹旭听到禀报之后，露出一丝冷酷的笑容，随即叫来蒲俊和苏岸，做具体的布置。"If the situation develops in this way, it is also to find the weakness of this" killer bee "? As long as we grasp our weaknesses and require our superiors to equip them with more flame throwers, will the situation be much better? Or can you use these 4 74 flamethrowers to attack these "killer bees" more effectively and hold the position more easily than this first encounter with "killer bees"? "I asked.I follow the execution process of this small program: first, I take exp and "\ +" as parameters, call the calculation (String, String) method in the AbstractCalculator class, call split () of the same kind in the calculation (String, String), then call the calculation (int, int) method, enter the subclass from this method, after executing return num1 + num2, return the value to the AbstractCalculator class, assign it to result, and print it out. This just verifies our thinking at the beginning.