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Well, the concept of IPTables is summarized here for the time being. After understanding the concept, it is absolutely appropriate to practice it in combination with actual commands.10南宋末年，小白为救许仙水漫金山，终被法海压在雷峰塔下。小青则意外被法海打入诡异的修罗城幻境。几次危机中小青被神秘蒙面少年所救，小青带着出去救出小白的执念历经劫难与成长，同蒙面少年一起寻找离开的办法。Console.log ("I finally saw Baidu's pen test questions");2. After opening the setting interface, click the Apply Two Places at Work function option;In the above code, we use three functions, order500, order200, orderNormal to handle its own business logic, If the current own function cannot handle things, We pass it to the following function to handle it. By analogy, Until there is a function that can handle him, Otherwise, the responsibility chain mode will leave the chain directly, telling that it cannot be processed and throwing an error prompt. Although the above code can be used as the responsibility chain mode, we can see from the above code that the Order500 function depends on functions such as Order200, so there must be this function, which also violates the open-closed principle in object-oriented. Let's continue to understand writing flexible and detachable responsibility chain nodes.一个年轻的拉脱维亚屠夫前往布鲁塞尔寻求更好的工资，但一系列的不幸导致他奇狗.cc受波兰罪犯的控制。