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P0M0=0xFF;　　【什么是「Pure O」】Both these attacks and SYN flooding target the victim's TCP application and can interrupt the victim's service at much less cost than brute force flooding packet methods. However, SYN flooding is very different from other TCP spoofing attacks. SYN flooding attacks the services of the new connection without affecting the established connection, while other spoofing attacks break the established connection and cannot block the new connection from the beginning. SYN attacks can be stopped only by modifying the initial handshake program, while other spoofing attacks require checking every piece of data throughout the connection life cycle. What SYN flooding and other TCP spoofing attacks have in common is that they all depend on the attacker's ability to send IP packets that disguise the source address, while the same way to defend them is to deploy more address filtering or use IP Security Protocol (IPsec).1943年，华北战场处于敌我僵持阶段，江崇义、王直、林奉天所在的皇协军3连随日军执行军事任务，战斗中，国民党173团部分被包围，日军残忍杀害了所有俘虏。面对同胞悲惨遇害，3连不甘再做帮凶，决定要集体造反。江崇义否定了林奉天投奔八路军的建议，率领手下弟兄投奔了国民党173团。国民党173团团长吴天对皇协军3连曾经协助日军攻击自己的事情耿耿于怀，林奉天所在的“三连”虽然有了国民军正式番号，但3连的补给和待遇都是最差的，173团早已将其视作羞辱，当成包袱，等待着把整个3连填埋在战场。日军发动了“撕裂行动”，吴天毫不犹豫指定3连担任阻击。林奉天与周冰谏组织敢死队，摸入敌军炮兵阵地，歪打误撞迟滞了日军的总攻击，如期完成阻击任务。在一次夜间行动中，3连遭遇了日军生化小队，但团部的指示是一切只能靠自己，3连又成为了炮灰连。日军开始疯狂地进攻，三连和日军进行了殊死搏斗……最后，林奉天、江崇义等人看清了国民党部队的真实面目，毅然投奔了八路军，经过炮火洗礼，最终成长为一支让日军闻风丧胆的英雄连队……Step 3: Specify Operations and Product Policies3. Some types, such as the core trading engine of the exchange, control the trading process. If multiple types can be created, the system will be completely chaotic. (For example, if there are multiple commanders in an army who command at the same time, there will definitely be a mess), so only by using the singleton mode can the core transaction server independently control the whole process. The following is an analysis of some examples that we need to pay attention to when applying singleton pattern in the development process.……庞取义有些尴尬地说道，长帆，我真的尽力了。