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Centos7, The service is no longer started using init-style scripts, Instead, the unit file is used, Therefore, commands like service iptables start can no longer be used in centos7, Therefore, service iptables save cannot be executed. At the same time, firewall is used to replace the original iptables service in centos7, but don't worry, we just need to install iptables and iptables-services through yum source (iptables are usually installed by default, but iptables-services are not installed by default in centos7). After installing iptables-services in centos7, the rules can be saved by the service iptables save command, as in centos6, and the rules are also saved in the/etc/sysconfig/iptables file.去京城，这话无疑勾起了一帮娃儿强烈的兴趣，眼中闪着跃跃欲试的光芒。弗朗机则不然，地处西洋，临海弹丸之地，航海、海战传统已有千百年，经验丰富，人皆会操船发炮，此役若非我们有海马船出其不意，怕是难以取胜。　　本片根据西尾维新的“忘却侦探系列”改编。《记忆之城》描述的是一段沉重的民族苦难史，在那烽火硝烟的战争时代慢慢展开。全剧以一个家庭的悲欢离合折射出一个社会的战争与和平，以周家大小为民族生死存亡奔波牺牲，歌颂了一批为民族而抛头颅洒热血的热血青年。1937年春天的北平。一位邮递员给周家小姐周敏柔送来了一封信，内容是她在日本留学的未婚夫朱今墨写来的，信里诉说了对敏柔的思念，并告诉周他此时身处的日本正像一架高速运转的战争机器，空气中到处充满战争的气味，此时的中国，一定会有很多人为民族人的未来而抗争奔走，他希望他的爱人能成为这中间的一员。这封信点燃了天真柔弱的敏柔内心的热情，这位年轻的大学教师，充满小资产阶级情调的大家闺秀拿着信跑到学校，参加学生们抗议日本军队猖獗的侵略活动。敏柔的父亲周祖康此时正在学校开会，他出于爱护学生，站出来规劝学生们，学生们却不领情，争吵中周祖康被推倒在地，敏柔正赶上这一幕，她并不知道这位狼狈的老者是他的父亲，周祖康却知道这就是他的女儿。State mode and policy mode are like twins. They both encapsulate a series of algorithms or behaviors. Their class diagrams look almost identical, but their intentions are very different, so they are two very different modes. The policy pattern and the state pattern have in common that they both have a context, policies or state classes to which the context delegates the request to execute