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In this paper,the main work is to extended the premitive model of rough sets;Accorting to the Rough structure and algebra structure,the main work is to study the application of rough set theory on algebra system-group,so that rough algebra system is better perfectly.

本文在现有的Pawlak粗糙集模型基础上，对模型进行推广；根据粗糙结构和代数结构及已有的研究成果的基础上，更进一步地研究了粗糙集理论在代数系统一群上的应用，以此建立较为完善的粗糙代数系统。

In the second chapter, we study the relationship between the fitting height and conjugacy class graphΓ~* of a solvable group.

第二章讨论可解群的共轭类图与其Fitting高的关系。

This study shows that the new non-equilibrium solvation formulation established in our research group is valid and reliable.

用实验数据的拟合结果以及与Lippert-Mataga公式的比较，表明新的非平衡溶剂化公式在预测光谱位移方面是可靠的。

According to breeding objective and the study on characteristics of wild southernwood resources, the plant types of southernwood were directionally screened by derived system method and group mixed method, the selected population were purified and their characters were identified, the variety comparative tests in muti-sites for many years were conducted for the purified types that passed identification.

方法］根据育种目标和对青蒿野生资源特征特性的研究，采用派生系统法和集团混合法对青蒿植株类型进行定向筛选，对中选群体进行纯化和性状鉴定，对通过鉴定的纯化类型进行多年多点品种比较试验。

It is necessary to study the continuing education of teachers as a special group.

教师作为一个特殊的群体，有必要开展对教师继续教育的研究。

The social group isolated for any given study is called speech community.

分离出来用于任何特定研究的社会群体称作言语社区。

Patients who underwent spinous process-splitting laminoplasty (n = 40) and control group (n = 20) were enrolled in the study.

对受试者分别进行颈椎最大伸展位和最大屈曲位的MRI扫描，获得12个不同角度的矢状面T1像。

Objective To study the infection of Spotted fever Group Ricketfsiase in wild rodent and tick in Zhejiang province.

摘要目的了解蜱、鼠中自然感染斑点热群立克次体的状况。

Study on stability of cavity group based on the coupling of surpac and phase2.

基于 SURPAC 和 Phase2耦合的采空区稳定性模拟分析。

The 1994 CHAOS Report from the Standish Group is the landmark study of IT project failure.

斯坦迪什集团1994年发表的 CHAOS 报告是一个具有里程碑意义的研究，该报告揭示了 IT 项目的整体失败。

The basic concept of FOP can be summarized as to further optimize effective prescription according to the standard of curative effects and with the aid of modern science and technology and theories of traditional Chinese medicine.

其基本内涵可概括为：以确有疗效的中药复方为研究对象，以现代科学技术和传统中医药理论为技术支持，以该复方所治病证的药效响应为评价标准，以优化重组疗效更优的新复方为研究目的。

Ever since our world has been a world, native forests have been indiscriminately exploited by man.

自从我们的世界一直是世界原生森林被任意剥削人。