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Some DNS servers will recursively send query requests to the upper DNS servers and wait for a response when they cannot obtain the resolution results of domain names, which further increases the resource loss of the servers.现在楚汉和谈的消息传出之后，韩信和彭越也担心到时候汉王势力急速扩大之后，他们自己的处境。影片主要讲述了九十年代的北方小镇，痛失未婚夫的环卫工人王芳遇到一名女婴，她决定领养这个孩子，但却遭到父母的强烈反对。执意的王芳无视父母的感受选择离家出走。然而生活的苦难接踵而至，为了生活她选择省吃俭用，她含辛茹苦地把孩子抚养成人后却积劳成疾，她和孩子的未来再一次变得扑朔迷离……敢问哪位是徐先生？哪个徐先生？何心隐问道。你爹和你小叔大哥要商议些事。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).