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Singleton mode: It solves the problem of the number of instantiated objects, such as factories and object pools in abstract factories. Except Singleton, other creative modes solve the coupling relationship brought by new.Xmind: It can be exported to other software formats, but the exported HTML, PDF and Word styles are similar, the exported text format is not very beautiful, and the important thing is that it cannot be well compatible with Microsoft Office.袁梅花拥有一个幸福的家庭，但为了照顾女儿和婆婆，她放弃工作。然而一场变故，让原本和睦的家庭濒临崩溃。梅花为了挽救家庭忍辱负重，但还是以离婚收场。生活的变故，并没有击垮梅花，她靠自己的努力，在朋友程有信的帮助下，开始重新创业。俩人不但把生意做好，还在合作中萌生爱意。当程有信和梅花的前任都想复合时，梅花突然听到程有信准备和前妻回美国，于是赶往机场向程有信求婚。两人为爱情而守候，为事业而奋斗。梅花的善良自信和果敢坚定，让她不但拥有了成功的事业，还她收获了幸福的爱情。赵文华多少？李天宠犹豫道：这类事本该上表朝廷，由军部、工部出头。According to statistics, SYN attack is the most common and easily used attack method among all hacker attacks. I believe many people still remember the attack on YAHOO website in 2000. At that time, hackers used simple and effective SYN attacks. Some network worms cooperated with SYN attacks to cause greater damage. This paper introduces the basic principle, tools and detection methods of SYN attack, and comprehensively discusses the prevention technology of SYN attack.Speak human words