Also developed for the PRA tree is an enhanced predictive range aggregate (EPRA) query algorithm which USES a more precise branch and bound searching strategy, reducing the disk I?
提出了一种增强预测范围聚集查询epra算法，采用更精确的剪枝搜索准则，减少了查询所需要访问的节点代价。
Methods: Based on a successful case from process, framework and skill of PRA, this article showed more experience that PRA was used in this project.
方法：通过一个项目案例，从PRA方法流程、框架、技巧等方面，说明pra方法在农村妇女生殖健康项目中的应用情况。
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