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Analysis: It mainly lies in retaining the plus and minus signs. The result is NaN, but note that NaN is not equal to all values, including itself.In order to prevent SYN attacks, SynAttackProtect mechanism is embedded in TCP/IP protocol stack of Win2000 system, and Win2003 system also adopts this mechanism. SynAttackProtect mechanism enables the system to handle more SYN connections by turning off some socket options, adding additional connection indications and reducing timeout time, so as to achieve the purpose of preventing SYN attacks. By default, the SynAttackProtect protection mechanism is not supported on the Win2000 operating system, and the SynAttackProtect key value needs to be increased at the following location in the registry:大梦一场，落魄少年立志要改变现状奋发图强创造一片新天地。珍奇异宝，功法武决，遗失的强者洞府，在这个天才辈出，充满挑战和机缘的时代，且看落魄少主如何闯荡大陆、遭奇遇，成为叱咤风云的至尊天帝。以前的仇人，现在，绝不会放过！梦中的遗憾，现在，一定要弥补！待到灵剑长啸之时，天地三界，我为至尊！"Is-A" refers to the "one" of one class and belongs to another class, while "Has-A" is different, which indicates that a certain role has a certain responsibility. A common reason for the wrong use of inheritance instead of aggregation is to mistakenly treat "Has-A" as "Is-A". For example:刚才他和葫芦没回来的时候，众人问张家人为何还没到。1941年年初的一个夜晚，由日本派到中国的秘密信使在上海的南京路被一伙身份不明的人所劫杀。他所带来的重要秘密信件被劫走。原来，这一伙身份不明的人是重庆国民政府中情局所训练出来的秘密特工——黑玫瑰行动小组。这个小组的组长是年轻漂亮的黎紫涵。黎紫涵从劫来的信件中只发现了5个字——“富士山的雪”，她断定这是日寇的一次重大的秘密军事行动。日本信使在南京路被杀的事件在沪上引起轩然大波。警察局高级探长郝瀚介入了本案的调查。日军驻沪最高司令松本严令特务机关的机关长熊井也要侦破此案，消灭黑玫瑰。松本司令在官邸要会见德国驻上海总领事汉斯。黎紫菡决定：夜闯松本官邸，劫取“富士山的雪”计划书。熊井为了避免“富士山的雪”被黑玫瑰窃取，决定动用王牌间谍“樱花皇后”并找到极司菲尔路76号里的大汉奸李逸群出山共同消灭黑玫瑰。经过调查，“富士山的雪”就是法西斯德国把刚刚生产出来的大规模杀伤武器运到了中国卖给日寇，投入到侵华战场上使用，逼迫重庆政府投降。黑玫瑰决心：无论付多大的牺牲，也要把这个大规模杀伤性武器摧毁。张良目光凝重的点点头，若是如此的话，改道进入韩国境内便是蒲俊和苏角自己的意思的。