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In programming, Sometimes it is necessary to generate a large number of fine-grained class instances to represent data. If we can find that these instances are basically the same except for a few parameters, if we can move those parameters outside the class instances and pass them in when the method is called, we can greatly reduce the number of individual instances by sharing the website invariantIn 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.Matrix metering: It is also called evaluation metering on Canon cameras. It metering the whole area of the picture. The exposure values of each area are averaged in the camera to obtain an average value, thus obtaining the correct exposure of the whole picture.6. Press and hold the two keys at the same time for 10 seconds. (At this time, if the Apple logo is displayed on the mobile phone screen, it means that you have pressed the key for too long and need to start over.)新锐企业家乔慕生重逢数年未见的高中同学苏念，已是杂志编辑的苏念为了采访不惜对乔慕生围追堵截，乔慕生无奈之下自曝自己的真实身份并非是乔慕生，没想到阴差阳错下与苏念开启了室友生活，不久苏念陷入同时爱上两个人的困境，直到她发现乔慕生的秘密……　　震宇原本想利用家乐来帮他改变人生，但他们两人之间的感情却逐渐萌芽，而且震宇发现，四个月后的程家乐在看似不起眼的意外中死亡，竟藏着真正破案的关键，震宇只能选择要挽救“失败的官司”或是“家乐的生命”之间其中一个，他会如何选择...不过，除了表达震惊和期待外，也有一些书友发帖，表示自己的担忧。