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Creates an object from its specific subclass. Q: How can it be realized? Answer: To create abstract classes derived from factories, that is, specific factories create specific products. Since products are to be created, product abstract classes and specific product classes are naturally needed.The foundation of SYN flooding attack is the design of three-way handshake when TCP is used to establish connection. The third packet verifies that the connection initiator has the ability to accept the packet at the source IP address used in the first request, that is, its return is reachable. Figure 1 shows the process of exchanging packets at the beginning of a normal TCP connection.德国ARD和ZDF电视台联合推出。讲述了一个手机APP下载后 只要你完成相应任务就能满足愿望，一开始这5个年轻人的愿望很单纯，后来随着事态发展，内心的欲望被打开，当邪恶逐渐被揭露，他们的生活再也回不到过去了…….20《别放精神线》是连载10年间点击率达到20亿次的网络漫画，是一部获得罕见点击率和接近满分的Naver人气网络漫画。在"放下精神"的家人展开的日常故事中，通过诱发笑声的网络漫画受到读者喜爱。李镇赫在《别放精神线》中饰演郑科长的儿子兼尚德大学电子物理系大学生郑信(发音同“精神”)。在续集中，除了马里子攻略男性的恋爱技巧、麻里子华丽的七大变化、为被男性哭泣的女性复仇等令人毛骨悚然的故事之外，还将有与香甜复仇社敌对的Bitter Revenge社登场等新的展开。