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For easier management, We can also create custom chains in a table, Place the rules set for an application in this custom chain, But custom links cannot be used directly, It can only work if it is called as an action by a default chain. We can imagine that, Custom chain is a relatively "short" chain. The rules on this "short" chain are all formulated for an application program. However, this short chain cannot be directly used, but needs to be "welded" on the default definition chain of IPTables before it can be used by IPTables. This is why the default definition "chain" needs to refer to "custom chain" as "action". This is a later remark. We will talk about it later. We can understand it more clearly in actual use.0 When the CLR is running, the delegate DoSth is actually a class that has a constructor with a parameter type of method and provides an Invoke instance method to trigger the execution of the delegate.一举两得的事情，机会只有一次，不容错过。该剧讲述了两个性格迥异，生活环境完全不同的女孩本无任何交集，直到某一个晚上，同在异地的两人阴差阳错坐上同一辆旅行大巴，命运将他们连接到了一起。Typical plot: Mom makes a surprise inspection, and the eldest brother is nervous. The camera swept through his room, which was extremely chaotic. When my mother opened the door, her blood pressure immediately rose. 　新书求收藏求推荐。CAT5: Category 5 Unshielded Twisted Pair? Twisted? Pair)? Unshielded twisted-pair cables are composed of multiple pairs of twisted-pair cables and a plastic sheath.