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The A/D bits exist entirely for the operating system's benefit. The Accessed bit tells the OS which pages have been recently used, enabling page replacement algorithms to choose pages to evict when memory runs low. The Dirty bit tells the OS which pages have been modified and must be written back to disk before eviction; clean pages can simply be discarded and re-read from disk later.，这一点在Line官方版本下载中也有详细论述
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Крупнейшая нефтяная компания мира задумалась об альтернативе для морских перевозок нефти14:56，更多细节参见纸飞机下载