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-Skills that can easily get feedback are suitable for self-study. For example, when programming and debugging run away, you will know what goes wrong. Continue to take English as an example. If you find some words and roots that you are not familiar with, add them to your favorites and repeat them when you are free. If you find that you cannot understand grammatical difficult prepositions, you need to read and learn about them. Feedback is very important, which determines whether learning is mechanical repetition or virtuous circle.　　星虎为拯救即将到来的末世危劫，接下封印着十二生肖真身的神器【十二药叉】，带着涉世未深的雪怜，茫然踏上寻找十二生肖转世之人的救世路途。为寻生肖，先要集齐地水火风四大有缘人，两人一路来到了树上之城凤凰城，历经妖魔血蜥蜴等劫难，方才寻到了睿智但多情自恋的米俊非，和古灵精怪的孩子王小鱼儿，并获开启药叉神力的【天缺玉盘】。星虎更是被玉盘神力带到遥远的贺兰荒原，历经曲折寻得羊生肖转世之人芷莘。所以，独孤求败又在这山谷中等了十年。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.出现在眼前。精致的视觉效果，细腻和凶暴并存的纵"Are you a... magician?" The cool breeze in the middle of the night blew the gusts of wine on his head, and he seemed to be covered with a layer of gauze. He could not see anything clearly, but this was even more sober.