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.
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，这一点在Line官方版本下载中也有详细论述
MaryLou CostaTechnology Reporter。旺商聊官方下载对此有专业解读
吳先生說問卷流於空泛，「現在不可以令我想到下一步怎樣做。」
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