经过两次车主爽约，我对返程坐顺风车已经不抱希望。情急之下，只能赶紧打开铁路购票App。运气还算不错，返程当天的二等座只剩3张，我手忙脚乱地选座、填信息、提交订单，付款成功的那一刻，悬着的心才落地。还好没被顺风车耽误返程，不然真不知道该怎么赶回去上班。
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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它们规模未必庞大，却共同构成中国自主游艇制造的产业底座：以研发为核心、以制造为根基，推动行业从“代工制造”走向“自主品牌”。，这一点在服务器推荐中也有详细论述