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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).该剧讲述了济公（陈浩民饰）在人世间济世救人、降妖除魔、普渡众生的传奇故事。他一次回到天庭，刚好遇上鬼面观音上天界想偷取无缝天衣，意外造成许多罗汉落入凡间，济公遂下凡寻找诸多罗汉，进而阻止鬼面观音危害人间。并先后经历“临安织造署寻亲、朝阳长公主再现、乞丐王子反生基、重建将军英雄心、厨神宫门三绝结、无缝天衣现人间、怒斩凝玉生死劫、济公金梨赐良缘、邪不胜正大对决”等单元，故事高潮迭起，剧情轻松逗乐。　　然而威廉他们很快发现，此次任务绝非如此简单，他们前行的路上充满凶险……《热血街区电影版2：天空尽头》是《热血街区》电影系列中的第三部。以南极探险队队长崔道衡(宋康昊饰)为首的6名队员在征服南极的过程中，最小的队员名宰(刘智泰饰)发现了80 年前遇难的英国探险队的一本南极日记，日记中记载的英国探险队同样由6人组成。随着这本南极日记的出现，探险队开始遭遇种种磨难……先是奇怪的疾病、然后是粮食的短缺、接着是一个又一个的意外、队员相继死亡。最终，探险队还是来到了距离南极大陆海岸最远的地点——南纬82度08分，东经54度58分的“不可抵达点”。Because some denial of service attacks take advantage of the vulnerabilities of network protocols, others seize the limited processing capacity of the network or equipment, the prevention and treatment of denial of service attacks has become a headache for administrators. In particular, firewalls, load balancing and other equipment, which are widely used on the backbone lines in most network environments, often become the bottleneck of the whole network when DDoS attacks occur, causing the paralysis of the whole network.