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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.
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第三十四条 单位以承包、承租、挂靠方式经营，承包人、承租人、挂靠人以发包人、出租人、被挂靠人名义对外经营并由发包人、出租人、被挂靠人承担相关法律责任的，发包人、出租人、被挂靠人为纳税人；其他情形下，承包人、承租人、挂靠人为纳税人。，更多细节参见旺商聊官方下载
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