Quadtrees are everywhere spatial data exists. Mapping services use quadtree-like tile pyramids to serve map tiles at different zoom levels (Bing's quadkey system, for example, addresses tiles as base-4 paths). Game engines use them for collision detection and visibility culling. Geographic information systems use spatial indexes to store and query spatial datasets. PostGIS uses GiST indexes (R-tree-style) for spatial queries on geometries, while PostgreSQL's core supports quadtree-like SP-GiST indexes for certain data types like points.
第二十七条 在法律、行政法规规定的国家考试中，有下列行为之一，扰乱考试秩序的，处违法所得一倍以上五倍以下罚款，没有违法所得或者违法所得不足一千元的，处一千元以上三千元以下罚款；情节较重的，处五日以上十五日以下拘留：
。搜狗输入法2026对此有专业解读
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"Our internet-connected devices use a proprietary radio system, which links the alarms together," says Nick Rutter, co-founder and chief executive of FireAngel. The connected alarms can send push notifications to users' phones via their home internet router.
（一）明知住宿人员违反规定将危险物质带入住宿区域，不予制止的；