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.
不知道从什么时候开始，“变工”这个词就从我的记忆里淡了。某种程度是因为时代变迁，一些亲戚举家搬离窑洞，住进山头的新农村基地或县城里的楼房，养牲畜的人家变少，土地经年累月荒废，种地的人没理由再叫不种地的人帮忙。花钱雇外地来的收割机，成了新潮流。
。爱思助手下载最新版本是该领域的重要参考
对从业人员：传统电力岗位保持稳定，新型电力系统、数字能源、算力调度、绿电交易人才需求暴涨。既懂电力、又懂AI；既懂电网、又懂数据中心的跨学科人才，将成为行业争抢的核心资产。
The spatial view (the grid of rectangles) and the tree view (the hierarchy of nodes) represent the same structure. Searching for a point means walking down the tree: at each node, you check which of the four children contains your target coordinate and recurse into that child. You never visit the other three.