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Public Object first ();宋庆龄是上个世纪具有世界广泛影响的重要历史人物，她为中国的民主革命奋斗终生，是中华人民共和国的缔造者之一，伟大的爱国主义，民主主义、和平主义和共产主义战士。她还在童年的时候，就认识了民主革命的伟大先行者孙中山先生，并以他为偶像，萌生了革命的志向。她从美国留学归来，正逢民主革命遭受严重的挫折，处在最艰难的时候，她毅然抛弃一切，投身革命，追随孙中山先生出生入死，南征北战，在血雨腥风的战争年代，救治慰问伤病员。她不顾自身安危两次智救孙中山脱险，并协助孙中山完成革命理论的撰写。在孙中山屡遭挫败对革命前途深感茫然之际，她及时协助他实行联俄、联共、扶助农工的新方针，推进了中国民主革命的深入发展。孙中山逝世后，在蒋介石发动“四·一二”叛变后，她团结国民党内的左派与蒋介石之流进行了殊死的斗争，并与投向蒋介石反动政权的宋氏家族彻底决裂。随后她出访苏联，旅居柏林，潜修马克思主义，认清了中国革命唯一的希望在中国共产党。此后，她坚定不移追随中国共产党，在白色恐怖下，她积极开展社会活动，组建“中国民权保障同盟会Give a specific example to facilitate everyone's understanding.If an attacker sends SYN packets quickly with their own undisguised IP address, this is a so-called direct attack. This attack is very easy to implement because it does not involve spoofing or modifying packets below the user layer of the attacker's operating system. For example, he can simply send many TCP connection requests to implement this attack. However, for this attack to work, the attacker must also prevent his system from responding to SYN-ACK packets because of any ACK, RST, or ICMP (Internet? Control? Message? Protocol) will cause the server to skip the SYN-RECEIVED state (go to the next state) and remove the TCB (because the connection has been successfully established or recycled). Attackers can do this by setting firewall rules, causing the firewall to block all packets (except SYN) to reach the server, or causing the firewall to block all incoming packets so that SYN-ACK packets are discarded before reaching the local TCP handler.项羽一点就通，知道亚父是点拨提醒自己，当即点点头，若有所思。这是一个人民警察与黑恶势力进行殊死搏斗的惊险故事；这是中国第一部描写“管警察的警察”的电视剧；这也是灵与肉、情与法、爱与恨、正义与邪恶、奉献与贪婪激烈冲突的人生戏剧。故事的主人公是公安战线第一代督察警，老百姓亲切地称谓他们为“警中警”……故事发生在绿江市。丁潮受人指使绑架了绿江市建筑业巨头丽都集团总裁张大洋，市公安局副局长马云山指挥刑警队，成功解救了人质，受到政法委陈副书记的高度评价。丁潮在医院莫名其妙地死去，这让刑警支队副支队长常健非常恼火，他认为丁潮的案子和三年前杀害了三名警察的“蓝平大侠案”有关。One problem with the factory method pattern is that the creation of the class depends on the factory class, that is to say, if you want to expand the program, you must modify the factory class, which violates the closure principle. Therefore, from the design point of view, there are certain problems, how to solve them? We use the abstract factory mode to create multiple factory classes, so that once new functions need to be added, we can directly add new factory classes without modifying the previous code. Because the abstract factory is not very easy to understand, let's look at the diagram first, and then it is easier to understand with the code.