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ing on issues of race and class. IceT was one of the first rappers to call himself a playa and discuss guns on record, but his theme tune to the 1987 film Colors contained warnings against joining gangs. Gangsta rap, made popular largely because of , brought rapping about crime and the gangster lifestyle into the musical mainstream. ? Materialism has also been a popular topic in hiphop since at least the early 1990s, with rappers boasting about their own wealth and possessions, and namedropping specific brands: liquor brands Cristal and R233。my Martin, car manufacturers Bentley and MercedesBenz and clothing brands Gucci and Versace have all been popular subjects for rappers. 樣例文本 C ? 如果一臺主機使用一個偽隨機數(shù)生成器來計算報告延遲 ,主機自己的一個專用 IP地址應該被用作生成的一部分 ,以避免多個主機產(chǎn)生同樣延遲順序的幾率 . ? 一臺主機應該確認一個收到的報告在其 IP目的域和 IGMP組地址域有同樣的 IP主機組地址 ,以確保該主機自己的報告不會被一個錯誤接收的報告取消 .主機應當放棄除了主機成員關系查詢 (Host Membership Query)或主機成員關系報告 (Host Membership Query)之外任何形式的 IGMP消息 . ? 多播路由器定期發(fā)送查詢以刷新當前特定網(wǎng)絡上的成員信息 .如果在一些查詢之后沒有收到一個特定組的報告 ,