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Advanced Mathematics (3rd Edition of Peking University): I don't read much books on linear algebra. I studied advanced mathematics when I was in school, but it doesn't matter. Just look at the first five chapters. Cooperate with the corresponding video and master the relevant knowledge of matrix and determinant.李越决定不去想它，只要知道秦始皇就是项少龙的学生就行了講述離家多年的大學生夏志薰，在大三暑假回到了睽違七年的故鄉桃園大溪，在過程中逐漸找回遺忘的童年，並逐步解開與家人間的多年心結的故事。白凡也沉声道：你二人若说的实话，就无需害怕。As Charlie Munger said: I keep seeing some people get better in life. They are not the smartest or even the most diligent, but they are learning machines. They sleep a little smarter every night than that morning.DDOS attacks mainly occur in the network layer. Its most obvious characteristic is to send a large number of attack packets, consume network bandwidth resources and affect normal users' access. At present, the detection and defense technology for DDOS attacks in the network layer is quite mature, and at the same time, some new attack methods-DDOS attacks in the application layer have emerged. Different from network layer DDOS attacks, application layer DDOS attacks mostly imitate the access behavior of legitimate users and will not generate a large number of attack data packets during data transmission, but they will consume server resources through a large number of database queries and other operations, which is more difficult to detect. According to the different attack modes, DDOS attacks include reflection amplification attacks in addition to ordinary flooding attacks. This type of attack often uses a legitimate server as a reflector, which sends a large number of data packets to the target, thus causing greater harm. At present, DDOS attacks against DNS servers are also common. Attackers often send fake domain names to DNS servers, consuming DNS server resources. At the same time, due to the recursive query mechanism in DNS servers, DDOS attacks against DNS servers have a large impact range."I see, you said the most difficult moment should be the 20 minutes of gun group transfer fire? So in essence, the reason for the fire gap is not that the artillery group has no ammunition, but that the ammunition is used elsewhere, that is, in the task of annihilating the sudden appearance of the Vietnamese artillery group, so during this period of time, you can only rely on yourself to resist the Vietnamese attack, right? "I said.