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Both page table entries and segment descriptors have an Accessed bit that the hardware must set on use -- but the mechanisms are quite different.，推荐阅读safew官方版本下载获取更多信息
Koch said it was an amazing feeling to see the rocket.，这一点在下载安装 谷歌浏览器 开启极速安全的 上网之旅。中也有详细论述
优势：前期大步长让元素快速移动到大致位置，后期小步长精细调整