Segmentation maps a logical address (a 16-bit selector plus a 32-bit offset) to a 32-bit linear address, enforcing privilege and limit checks along the way. Paging then translates that linear address to a physical address, adding a second layer of User/Supervisor and Read/Write protection. The two layers are independent: segmentation is always active in protected mode, while paging is optional (controlled by CR0.PG).
事实已经证明了这一点。春节期间，因为新机价格普遍上涨，把不少消费者推向了那些芯片稍老一代、但内存配置同样不低的老产品。一位手机专卖店老板指着柜台里的样机表示，“现在不少年轻人进来就问，有没有前两年的旗舰款”。
。关于这个话题，服务器推荐提供了深入分析
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conn = sqlite3.connect(DB)