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First, Cat5 is referred to as Category 5 and Cat6 is referred to as Category 6. The difference between the two lies in the different spacing of twisted pairs. CAT5 has relatively large spacing, CAT6 has relatively tight spacing and the transmission rate is much higher than CAT5E.秦旷听后，默默思索。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.This appendix includes routine examination items, methods and some disease identification principles for each department. For items that are consistent with the requirements of clinical examination, the physical examination shall be carried out according to the clinical examination method. Special items can be checked when necessary.Visitor mode is to encapsulate some operations applied to a certain data structure. Once these operations need to be modified, the data structure that accepts this operation can be saved unchanged. Visitor mode is suitable for systems with relatively stable data structures. It reduces the coupling degree between data structures and operations acting on data structures, making the set of operations relatively free to change. The specific structure diagram is as follows:日本战国时代，一个满目荒凉穷山恶水的山村里，每年麦收的时候，都会遭到强盗的袭击。这一年，村民们决定雇佣七名武士来保卫他们的村庄和收成，七名武士分别是勘兵卫、久藏、胜四郎、五郎、七郎、平八和冒充为武士的农民菊千代。武士勘兵卫是个步伐矫健、作战经验丰富的人，他负责指挥全村人进行防御准备。在突袭强盗老巢的行动中，武士久藏和菊千代杀死数名强盗，但武士平八为救农民利吉中弹身亡。武士和村民们手握铁锹、竹矛死守村庄，巧妙击退了强盗的一次次进攻，但在抵抗中片山五郎兵卫战死。决战之日，13名强盗骑马冲入村庄，格斗中，强盗用火铳击中了久藏。菊千代怀着愤怒和仇恨杀死了最后一个敌人，自己也因中弹倒地而亡。强盗终于被尽数歼灭，但村民们也付出了很大代价，七名武士最终阵亡四名，留下坟冢上四把武士刀刺入天穹。大战过后，武士们离开村落，武士中的首脑人物勘兵卫不禁感叹：“这也是场败仗……赢的并不是武士，而是农民。”