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Or in a very dark environment, in the absence of other light sources, autofocus usually cannot find the focus. In these cases, you need to use manual focusing. To take more accurate pictures of the main body of the picture you want to capture.A large number of SYN requests cause the unconnected queue to be full, making the normal TCP connection unable to successfully complete the three-way handshake. This pressure can be relieved by increasing the space of the unconnected queue. Of course, backlog queues need to take up a large amount of memory resources and cannot be expanded indefinitely.Now, let's imagine why these "checkpoints" are called "chains" in iptables. As we know, The purpose of a firewall is to match "rules" for passing messages, Then execute the corresponding Action, So, when the message passes through these checkpoints, You must match the rules on this level, However, there may be more than one rule on this level, But there are many rules, When we put these rules in a chain, A "chain" has been formed. Therefore, we imagine each "checkpoint" as shown in the following figure. In this way, it is more appropriate to call them "chain". Each message passing through this "checkpoint" must match all the rules on this "chain". If there are qualified rules, the corresponding actions of the rules will be executed.AI-CPS OS正确的顺序应该是先写《射雕英雄传》、《神雕侠侣》，然后再写《倚天屠龙记》。老实木讷的宅男级IT上班族大雄（何润东 饰）最近几天倒霉到极点，现实被富二代少女小爱（景甜 饰）的车门撞飞，而后被当作吃霸王餐的落跑者，没钱吃饭、工作被炒、桌球挨屠，总之可以想见的倒霉事他全部中招。不过他因此和小爱相识，还莫名其妙地成为了对方的奴隶。在小爱的张罗下，大雄找到一份新工作，却在上班时发现老板Emma竟和小爱长得一模一样。他的生活变得愈加有趣起来……