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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).
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The president’s cuts have defunded and alienated thousands of American scientists. Europe can benefit, if it makes the right offer
圖像來源，BBC Chinese / Lok Lee
在每年11月到翌年2月中旬的南極夏季期間，麥肯齊負責管理駐守「哈利六號」的40人團隊。