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.
去年11月，第三届沙特国际手工艺周在利雅得努拉公主大学举行，中国作为主宾国亮相。中国馆内，中国工艺美术馆组织千余件手工艺作品展出，并邀请20位非遗代表性传承人现场展示技艺。中国馆外，安徽花鼓灯、广东醒狮、川北大木偶戏和陕西华县皮影戏等非遗项目每天在核心区域展演，观众争相与演员合影。沙特遗产委员会手工艺部主任达利娅·叶海亚表示，沙中两国在手工艺领域都有着悠久历史，纺织、刺绣等技艺相近。本届手工艺周上，两国手工艺人交流探讨、分享经验，促进文化互学互鉴、共同发展。
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（一）居民委员会财务收支情况；
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The NHS: Menopause
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