Александра Качан (Редактор)
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2. 防水涂料检测报告强制性检测参数不全。（不符合《陕西省建设工程质量检测报告格式及编写指南》附录4中关于必备检测参数的要求。）
A quadtree does the same thing for two-dimensional space. It takes a rectangular region and divides it into four equal quadrants: northwest, northeast, southwest, southeast. If a quadrant has too many points in it, it subdivides again and again. Each subdivision creates smaller and smaller cells where points are densely packed.
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