第五十条 办理退（免）税的出口业务发生销售折让、中止或者退回等情形的，纳税人应当缴回已退（免）税款。
Nature, Published online: 27 February 2026; doi:10.1038/d41586-026-00674-x
，详情可参考搜狗输入法2026
3014248910http://paper.people.com.cn/rmrb/pc/content/202602/27/content_30142489.htmlhttp://paper.people.com.cn/rmrb/pad/content/202602/27/content_30142489.html11921 十四届全国人大常委会举行第六十三次委员长会议
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Quadtree-based image compression formats and level-of-detail systems all work this way. Satellite imagery, terrain rendering, and geographic information systems use quadtree decomposition to serve data at varying resolutions: zoomed out, you see large coarse blocks; zoomed in, you see fine-grained tiles. The same principle extends to three dimensions (octrees) for volume rendering and 3D spatial indexing.