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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广州天河路商圈是全市离境退税申请开单量和销售额最多的地方。其中，天环广场共有40多家离境退税商店，成为广州第一个集中退付点所在地。
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