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Public class SourceSub1 extensions Wrapper2 {丈(余文乐饰)是特别职务队(俗称放蛇)的警员，正注守深水区。他在这个暴力血腥肉欲横流的世界里自有一套生存方法，常与黑帮及妓女为伍，生活没什么目的，与其说是警察，他其实更像一个古惑仔。苞谷摸摸小肚子，点了点头，他一上午才吃了几块点心和几颗松子，当然饿了。IGMP means Internet Group Management Protocol. This protocol is used to establish and maintain multicast group membership between IP host and its directly adjacent multicast routers, but does not include the dissemination and maintenance of group membership information between multicast routers. This part of the work is completed by each group of broadcast routing protocols. All hosts participating in multicast must implement IGMP.Some DNS servers will recursively send query requests to the upper DNS servers and wait for a response when they cannot obtain the resolution results of domain names, which further increases the resource loss of the servers.