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How can the average person afford that hard disk? The task of deliberate practice should be moderately difficult, feedback can be received, and the practice should be repeated enough times, so that the learner can correct his own mistakes.When the client SYN packet arrives at the filter gateway, the SYN agent does not forward the SYN packet, but actively replies the SYN/ACK packet to the client in the name of the server. If the client's ACK packet is received, it indicates that this is normal access. At this time, the firewall sends the ACK packet to the server and completes three handshakes. The SYN agent actually replaces the server to deal with SYN attacks. At this time, the filter gateway itself is required to have strong ability to prevent SYN attacks.B) Design principles. Many people have listed seven principles, such as single duty principle, opening and closing principle, Richter substitution principle, dependence inversion principle, interface isolation principle, composite reuse principle and Dimit principle. LSP, I elevated it to one of the three cornerstones of the object-oriented paradigm; Single responsibility and interface isolation are mainly used as the principle of responsibility division in object-oriented analysis/OOA, which you can not pay much attention to at this time. Relying on the inversion principle, I throw it away as garbage, because the opening and closing principle or directly "relying on abstract type principle" already contains the essence of relying on the inversion principle, while the dross of relying on the inversion principle is inherited by IoC. Of course, the pullback, I emphasize very much. Therefore, you need to master the abstract dependency principle (OCP), one-way dependency principle (including the learning of callbacks) and the minimum dependency principle (composite reuse principle, Dimit rule).故事讲到陈山聪跟李施嬅是一段前世今生的孽缘爱情，由六十年代拖到现代，而在六十年代时，金宵大厦已经存在，所以他们的孽缘爱情在今世再续前缘。其间金宵大厦怪事不断，不停上演着其他住客的人生及奇幻故事！摩托车手KC比赛时总是小心翼翼，而与他同为赛车手的弟弟瑞普却是个天才，敢于尝试各种危险的技巧。兄弟两人一直联手参加超级车赛，相互鼓励，不断在世界级的摩托车超级比赛中取得胜利。KC赛车的费用都有赞助商提供，而这比赞助却导致兄弟之间的矛盾，为此，他们被迫走上了不同的生活道路——瑞普离开了KC，成了一个没有赞助的私人赛手，两人因此成了竞争对手。不久，KC的赞助商破产，而瑞普的赛车事业也受到威胁，与此同时，他们的父亲离奇死亡了。这时，两人才意识到必须把两人的矛盾仍在一边，共同为即将到来的拉斯维加斯摩托车越野锦标赛作准备，使KC战胜世界上最棒的赛车手，并寻找父亲死亡的真相……"Look at your image is also OK, why is the company research report made like this!!!" Take the bag and leave.