Chapter III Qualification License
玉米并不是愚笨的孩子，相反，他也是相当聪明的。
In addition to solving the port problem of A, the serial number problem also needs to be paid attention to. The serial number corresponds to the sliding window. The fake TCP packet needs to be filled with the serial number. If the value of the serial number is not in the sliding window of B when it is sent to B before A, B will actively discard it. So we need to find the serial number that can fall into the sliding window between AB at that time. This can be solved violently, because the length of a sequence is 32 bits, and the value range is 0-4294967296. If the window size is like 65535 under Windows I caught in the above figure, I only need to divide, and I know that at most I only need to send 65537 (4294967296/65535=65537) packets to have a sequence number fall into the sliding window. The desired value can be calculated quickly by exhaustion on multiple control hosts.
刘邦仍是久久的心潮澎拜，兴奋道：走吧。
被一个蔑视的情人折磨并留下来死去，一个女人发现自己内心的力量可以恢复并对她的施虐者进行报复。
However, it seems that it is deliberately against you. Just as you unpacked it, the package exploded.
松尾铃木与女优的30分钟
电视剧《一个人战争》讲诉了发生在真实和残酷的抗战背景下，在紧凑的8天内一小队特殊组合的人群的抗战故事。
I am the only Kirgiz reporter in the 85-year history of Xinhua News Agency. Over the years, I have traveled tens of thousands of kilometers and interviewed many stories about border protection. As a reporter, I will use the power of news to continue the story of Kirgiz people protecting the border.
2025年，从毁灭性的恐怖袭击导致的2020年东京奥运会终止开始，联合国控制了之前东京奥运会在东京湾边界的会址地区，并使之脱离了日本的管制。
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说着，眼光瞄向那些军士。
后面就是小葱姊妹的马车了，山芋、南瓜兄弟骑马还在后一步。
到了周家，见了满头白发的周夫子，板栗等人恭敬地给老人磕头。
一对刚刚参加完朋友婚礼的年轻夫妇詹姆斯(斯科特·斯彼德曼)和科尔斯腾(丽芙·泰勒)在回家的路上遭遇事故。两人将汽车停在了马路边，打算趁着尚未彻底黑下来的暮色，在周围的房子里寻求帮助。但是，由于对环境的不熟悉，两人误打误撞之后，无意间误入一所废弃的大房子。令夫妻二人万万没有想到的是，从两人踏进这所恐怖的黑屋子开始，他们的厄运便从此开始了……
更有那小女孩们，满眼满脸都是憧憬和渴望。
泰国女星pancake、男星Hunz、和女星jakjaan要合作新电影《Don’t Sleep My Hero》啦，Pancake姐姐终于回来演戏啦，喜大普奔!对于pancake&hunz这个新组合，大家期待吗?
历经艰辛刚摆脱非洲土人的追杀，飞鹰Jackie（成龙）就接到伯爵的急电，要其迅速赶到西班牙。二战末期，知道自己来日不多的德国纳粹把在欧洲抢掠所得的数万吨黄金隐藏在了非洲撒哈拉大沙漠一个秘密基地，伯爵急电Jackie，正是要其配合冷艳的考古专家Ada（郑裕玲）再赴非洲寻找这批黄金，途中，藏金副官的外孙女Elsa加入寻宝队伍。
D > B enters the synchronized block, and since instance is not null at this time, it immediately leaves the synchronized block and returns the result to the program calling the method. E > At this point, thread B intends to use the Singleton instance, only to find that it has not been initialized, so an error occurs. Therefore, there is still the possibility of errors in the program. In fact, the running process of the program is very complicated. From this, we can see that it is more difficult and challenging to write programs especially in multi-threaded environment. We further optimized the program:
