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1. Normal life cycle: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.不是嘲笑的笑容，而是开心的笑容。《犀利仁师》是由海润影视、浙江东阳稻草熊影视文化有限公司和海润影视吴奇隆工作室联合出品制作的大型古装校园励志喜剧，由吴奇隆担任制作出品人和主演。主要讲述古代学院里学生间以及与老师间妙趣横生的故事。为倡导男女平等，圣上推出女子入学政策，却遭到保守势力的暗中反对。为确保这一政策顺利推行，身为密探的江湖侠客柳傲天进入弘文学院，成为一名老师。在他的巧妙推动下，一批个性身份迥异的学生进入了弘文学院。多姿多彩的学校生活就此展开。因为阴错阳差，柳傲天与大龄剩女路云霏之间产生了误会，路云霏一路追来弘文学院，也成为了一名女老师。这对欢喜冤家在吵吵闹闹的同时，还解决学生的烦恼，促进了学生成长。两人在患难之中渐生爱意，却不料另一名男老师聂文星意外搅入他们的爱情之中。保守势力暗中频频对弘文学院下手，危机之中，柳傲天运用他的智慧，带着老师和学生们见招拆招，更因此培养了学生们聪慧勇敢的个性。与此同时，柳傲天意外发现了弘文学院里竟然深藏着一只保守势力的黑手，为了揪出这只神秘黑手，柳傲天不顾安危，挺身迎战。电视剧《三军大会师》讲述了红军从1936年4月即将结束东征，红军一、二、四方面军历经西征、甘孜会师，北上、会宁大会师，将台堡大捷，重创国民党部队，展现了毛泽东、周恩来、朱德、彭德怀等一批历史风云人物，以及红军队伍中的铁家父子以及程家姐弟等一批小人物，他们在会宁大会师前后的坎坷选择和经受的历练等。(3) Instruments, equipment and facilities suitable for the maintenance and testing business scope of fire fighting facilities;