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A program based on policy mode consists of at least two parts. The first part is a set of policy classes, which encapsulate specific algorithms and are responsible for specific calculation processes. The second part is the environment class Context, which receives the client's request and then delegates the request to a policy class. We first use traditional object-oriented to implement it.四面包围，务使一人漏网，然后焚烧魔教巢穴，彻底覆灭魔教。1941年日本人肆虐中原，与汪伪政府狼狈为奸疯狂杀害共产党人，我党损失无法估量。为完成民族解放大业，共产党人毅然在硝烟四起的战场予以敌人迎头痛击。同时建立起发达的地下网络截取敌人情报、消灭反动人员。这些英勇的地下人员就像一道汹涌的暗流推动着抗战胜利的进程。That is to say, a total of false syn messages will occupy the TCP preparation queue for 63s, while the semi-connected queue defaults to 1024, which is different by system default and can be viewed by cat/proc/sys/net/ipv4/tcp_max_syn_backlog c. That is to say, sending 200 fake syn packets per second without any protection is enough to burst the semi-connection queue, thus preventing the real connection from being established and responding to normal requests. The end result is that the server has no time to ignore the normal connection request-denial of service.•希望之夢（菅野美穗）……ps：第二更到了，请查收。等张杨落衙，张槐也进来，两人听说了今天的事，都赞同带苞谷上王家赔礼。