第四十九条 国家严格限制铀浓缩设施、设备，乏燃料后处理设施、设备，重水生产设施、设备等物项及其相关技术等核扩散敏感物项，以及可以用于核爆炸装置的材料的出口。
Both page table entries and segment descriptors have an Accessed bit that the hardware must set on use -- but the mechanisms are quite different.
。91视频对此有专业解读
人 民 网 版 权 所 有 ，未 经 书 面 授 权 禁 止 使 用，这一点在Line官方版本下载中也有详细论述
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