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In order to prepare a zero-based environment, we will empty the rules provided by default in centos6 so that we can carry out experiments and use the iptables-F INPUT command to empty the rules in the INPUT chain of the filter table. Later, we will summarize the relevant commands for clearing the rules separately, and there is no need to struggle with this command here.那还留着这些东西干什么？聪明鬼道：对。Avoid coupling the sender and receiver of the request, make it possible for multiple objects to receive the request, connect these objects into a chain, and pass the request along this chain until an object processes it. This is the responsibility chain mode. In the responsibility chain mode, it is possible for each object to process the request, thus realizing decoupling between the sender and receiver of the request. At the same time, the responsibility chain mode simplifies the structure of the object, which makes each object only need to refer to its successor without knowing the whole chain, thus improving the flexibility of the system and making it more convenient to add new request processing classes. However, we cannot guarantee that all requests can be processed in the responsibility chain, and it is not conducive to observing runtime characteristics.革命史诗剧《我们的法兰西岁月》讲述了周恩来、邓小平、陈毅、聂荣臻、李富春、李维汉、李立三、蔡畅、傅钟、何长工、萧三、赵世炎、蔡和森、王若飞、陈延年、陈乔年、向警予等革命者赴法留学的故事。 　　版本一/farewell (farewell)终于能一劳永逸解决赵高的追杀，身为家主的范文轩自然格外开心。