调试技巧：加打印语句观察每轮变化
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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代表团表示，将力争优异成绩，实现运动成绩和精神文明双丰收。
（五）违反本法第五十一条的规定，未依法提供技术支持、协助与保障的。