重点区域示范，引领效应日益凸显
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The 386 supports four privilege rings (0 through 3), though in practice nearly all operating systems use just two: ring 0 for the kernel and ring 3 for user programs. Three privilege levels interact on every segment access: CPL (Current Privilege Level), DPL (Descriptor Privilege Level), and RPL (Requested Privilege Level).，推荐阅读safew官方下载获取更多信息
做完这一切，我稍稍安了点心。作为一名软件工程师，我有足够的自信，这三道关卡足以将那些数电信骗子挡在门外。