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We know that IPTables acts according to rules. Let's talk about rules. Rules are actually predefined conditions for network administrators. Rules are generally defined as "if the packet header meets such conditions, this packet will be processed in this way". The rules are stored in the packet filtering table in kernel space, specifying the source address, destination address, transport protocol (such as TCP, UDP, ICMP), service type (such as HTTP, FTP, and SMTP), and so on. When packets match the rule, iptables processes these packets according to the methods defined by the rule, such as accept, reject and drop. The main task of configuring a firewall is to add, modify, and delete these rules.Forty-third fire control technical service institutions in any of the following circumstances, the licensing of the public security organ fire control institutions shall cancel its qualification:Picha用了将近全部婚姻生活的时间去期待丈夫Pomon在婚姻里的忠诚，两个人都太自我，太以自我为中心，不知怎么去爱对方，最终他们的婚姻也随着第三者的介入走向破灭。 因为婚姻的破灭让Picha痛苦不堪，也让她不敢不想再结婚。Ramin，不奢望一定要去占有她的爱她的人，他是为了Picha的微笑而活。Picha是他生命中在心里唯一的爱人，是第一个也是最后一个倾心爱的人。 (4) The list of employees of the branch and their ID cards, the qualification certificate of registered fire engineers and their social insurance certificates, the professional qualification certificate of special types of work in the fire protection industry, and photocopies of labor contracts;"I can't die, and I have repeated every song of his 18 times in a single."If you finally return from FirstActivity, then the SecondActivity page will be completed after all the FirstActivity previously pressed into the stack is returned, and then you can exit the application at one time.我也是随便答答。