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Next, we will talk about the responsibility chain mode. There are multiple objects, each of which holds a reference to the next object, thus forming a chain on which requests are passed until an object decides to process the request. However, the sender does not know which object will process the request in the end, so the responsibility chain mode can be implemented to dynamically adjust the system without concealing the client. Let's look at the diagram first:0 Registers a delegate instance for the event through the constructor of the DoSth delegate17日，据电视台相关人士透露演员罗惠美将出演KBS1新日日剧《不管谁说什么》，并担任女主人公朱宝拉（音）。该剧主要描绘了再婚家庭中发生的故事，讲述再婚家庭子女们一同经历父母离婚和再婚后，与世上的偏见斗争，在事业和爱情面前克服难关不断成长的内容，该剧将通过充满诙谐的人物为观众带来真实的欢笑和感动。女主人公朱宝拉（罗惠美饰）是一名兼具美丽微笑和才华、幽默感的气象播报员。为了不想让单亲家庭成为瑕疵，她付出了比别人多两三倍的努力。之后遇到了慈祥和蔼的新爸爸，她将迎来内心温暖的变化。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.True or False最后还是一个网友一语道破玄机，这才让大家豁然开朗。