The test results show that : 1 . under giving conditions , two explosives with the same atomic number ratio have similar combustion performances , 2 . the pressed charge and the powder charge shows observably different combustion characteristics , 3 . within 211 . 7 m - 635 . 0 m , decreasing the grain size may enhance combustion velocity 通过对测试结果的分析表明，在特定条件下具有相同原子组成比例的炸药，其燃烧性能相近；同种炸药的药柱和药粉燃烧性能差异较大；在211 . 7 635 . 0 m范围内， hmx 、 rdx颗粒越细，燃烧越快。
To the problem that finding rules in enormous data is very time - consumable and the expansibility of existed algorithms is not very good , the thesis proposes a new method to discompose large data table based on the concepts of positive region and the importance of attribute in rough set theory . existed algorithms of rule deduction can be applied directly on the tree structure obtained by partition and the times for computation will be reduced observably . validation of information entropy on the partition structure shows that the partition of data table will not lead to the loss of information , while the computing speed increases at the same time , which reflects the practicability and rationality about the partition of large data table 针对海量数据处理起来极为耗时，现有算法拓展性较差的问题，基于rough集理论中的集合正域概念以及由此定义的属性重要性概念，提出一种大型数据表分解算法，现有的规则归纳算法可直接在分解得到的树型结构上应用，将大大降低知识发现的时间，并从信息理论的角度利用信息熵概念对该分解结构进行了验证，分析了这种分解的实用性及合理性，揭示了这种分解结构在提高计算速度的同时不会损失信息量。
Arbuscular mycorrhiza can improve the ability of resisting drought from several aspects : hyphal enhances plants ' chances of absorbing water from soil ; it can improve plants ' phosphorus and another minerals ' nutrition , increase the content of chlorophyll ; observably enhance transpiration and stoma conduction ; reduce the flow of water , permanent languish point , stoma resistance ; change the balance of hormone , promote accumulation plant proline and capability of nitric reductive enzyme 丛枝菌根真菌可以通过以下几个方面增强植物抗旱性：通过菌丝增加植物对土壤水分的吸收；改善植物的磷营养及其他矿质元素营养；能显著提高蒸腾速率和气孔导度；干旱条件下降低植株叶片水势、永久凋萎点、叶片饱和亏、气孔阻力和恢复时间；改变激素平衡。
