作用中心

As the center or the Algebra subalgebra of a algebra plays an important role in reducing the number of state variables, the cartan subalgebra is a maximum Abelian subalgebra of an algebra, so it can be a powerful tool for the structure simplification of control systems.

由于代数的中心，或交换子代数在系统的变量降低方面具有重要作用，而Cartan子代数是李代数的极大交换子代数，因而它能成为简化系统结构的有力工具，第二部分利用向量场的积分曲线所定义的映射，构造出一个S—坐标，在该坐标下任一向量场都有一个标准的表示方法，一种无穷级数表示方法。

On the radio and television group property management staff of the Centre for Research on incentives Abstract Radio and TV Group Property Management Centre staff of radio and television group is the core component of the employees, their group of radio and television have played a crucial role.

摘 要：广电集团物业管理中心员工是广电集团员工的核心组成部分，他们对广电集团的发展发挥着至关重要的作用。

My thesis aims at analyzing three problems from normative and demonstrative perspectives to speak on good grounds. It lucubrates structure of fiscal policy on agriculture, in view of governmental and its policies' leading role.

考虑到政府力量的主导作用和财政政策的导向作用，因此，作者在选题时和在写作的过程中将构建财政支农政策框架作为主题和中心。

However TGase activity did not change significantly by increasing Zn2+ initial concentration.TGase activity did not change significantly when the fermentation culture was dialysed with EDTA addition. according to the change of biomass at different Zn2+ initial concentrations, the author considered that Zn2+ was not the component or active centre of TGase.

EDTA透析对TGase的酶活没有产生明显影响，结合不同Zn2+含量时SK4.001生物量的变化，作者认为，Zn2+在SK4.001发酵产TGase中同时具有营养和促进SK4.001产TGase的作用，但Zn2+并不是TGase的构成部分或活性中心，有关Zn2+促进SK4.001产TGase中的具体作用机理仍有待进一步研究。

The observation that MMPs and TIMPs are central to tissue remodeling and may contribute to organ failure promoted us to investigate the role of MMPs andTIMPs in acute panreatitis.

MMPs和TIMPs在组织重建和促进器官衰竭中的中心作用提示我们去研究急性胰腺炎中MMPs、TIMPs的作用。

The results ofthe addition of lithium phosphine showed the operation of a double stereo-differentiation effect and the chirality of the sulfinyl group dominated the asymmetricinduction.

在亚磷酸锂盐的加成反应中，这两个手性基团起双重诱导作用，其中亚磺酰基的手性中心起主导作用。

In this thesis, on the basis of theoretical analysis, numerical simulation and test study, the working principle and working process of central tube explosive ejection device and combustion gas ejection device equipped with star-shaped frame are analysed, the mathematical model of the inner ballstics of ejection devices and dynamical ejection model of submunition are established.

本文在理论分析、数值模拟与试验研究三者相结合的基础上，分析了中心管式爆炸抛撒装置与星形框式燃气抛撒装置的作用原理和作用过程，建立了抛撒装置内弹道的数学物理模型以及子弹抛撒动力学模型。

Therefore,in doing student work, they must firmly carry out the party's basic line, give priority to education in ethit,strengthen the teaching of the "two lessons"(morl and Marxist-Leninist lessons),so give fo full play to the "two lessons" in education in ethic,adhere to the Principle of taking academic teaching a...

因此，高校学生工作必须坚定不移地贯彻执行党的基本路线，必须坚持德育首位的原则；强化&两课&教学，充分发挥&两课&在德育工作中的主阵地作用；要坚持以教学为中心的原则，克服思想教育与教学工作&两张皮&的问题；要从严治校，加强学生管理，建设好学生骨干队伍，充分发挥学生的&三自作用&。

Saddle shaped AMF can produce a radial expanding force, which has more effective effect on resisting the pinch effect of self-generated azimuthal magnetic field of arc current. This effect of saddle shaped AMF can keep vacuum arc in diffuse mode under much higher current. So the limiting current interruption capacity of vacuum interrupter can be enhanced.

为了进一步提高纵向磁场对真空电弧的控制作用，本文提出在真空灭弧室的触头间引入从触头中心向边缘逐渐增强的非均匀纵向磁场，马鞍形纵向磁场会对真空电弧产生一个径向扩张力，而纵向磁场分布的合理设计可以使这一扩张力进一步抑制真空电弧自生环向磁场对电弧的箍缩作用，从而使真空电弧在更大的电流时仍能保持在扩散态，使真空灭弧室的极限电流开断能力得以提高。

It is concluded in Chapter Eight that: 1 linguistic proficiencies in three languages play a considerable part in code-switching of EFL teachers in trilingual context; the inter-sentential switching outweighs the intra-sentential switching both in frequencies and percentage; discourse-related switching also outweighs participant-related switching in frequencies and percentage; the EFL is maintained longest in EFL classroom and the language maintained second longest depends upon learners" higher proficiency in Chinese or Tibetan. 2 Ethnic identity and educational background is the major causal factor of EFL teachers" Chinese-English switching in trilingual classroom; duration of language contact and relative trilingual proficiencies are the two principal contributors to the English-Tibetan switching; while Tibetan-English switching is mainly driven by EFL teachers" ethnic identity and education background, as well as the duration of language contact; English-Chinese switching is also largely motivated by the duration of trilingual contact; and Chinese-Tibetan switching is determined by trilingual proficiency to a considerable extent. Meanwhile, psychologically, the switching is mainly motivated by a procedure of psychological projection, trilingual system conceptualization and the mentality of trilingual selection. 3 The educational reflections upon this study indicate: firstly, in trilingual context, the teachers" classroom discourse is characterized by the multilingual involvement, flexibility in strategy option as well as the extension and strengthening of the domination of teachers" discourse. Secondly, the discourse movement and code-switching are largely affected by two cultural ecological mechanisms: enculturation and cultural manipulation. Thirdly, the status quo of EFL trilingual teachers are characterized by unbalanced trilingual proficiencies, poor cultural awareness, and little knowledge of trilingual education and trilingual code-switching, therefore, suggestions are advanced in the end to provide them further education. Fourthly, in trilingual context, the EFL curriculum for ethnic minorities is characterized by plurality of aims, complexity of organization and variety of resources. Meanwhile, it is of great necessity to understand the linguistic values of EFL education for ethnic minority learners. To be specific, firstly, we should not only have a deep understanding of the distribution, construction, function as well as communicative effects of the three languages, but also have a comparative study of the three languages and thus provide the standardization and guidance for the trilingual education. In the end, it is advanced that trilingual EFL provision for ethnic minority should pursue to develop learners" multicultural value system in which first language culture and mother language culture take the central position and EFL culture plays a vital role.

3在三语环境下，教师课堂话语具有话语形态多元化、话语选择策略具有灵活性和教师话语权得到延伸和拓展等特征；文化涵化和文化操控是影响三语教师课堂语码转换的两种文化生态机制；参差不齐的三语水平、淡薄的多元文化意识和对三语教学和语码转换缺乏科学认识是我国目前三语师资的主要特点，因此应对三语教师进行职后继续教育；在三语环境下，民族外语课程具有课程目标多元化、课程组织复杂化和课程资源多样化等特点；应对民族外语教育的语言价值进行审视和解读，对三种语言在课堂话语中的分布趋势、结构特征、功能作用和交际效果等问题进行深入研究，加强对三种语言间的对比分析研究，同时对民族外语教育中的三语教学进行规范和指导；在强调民族文化和二语文化在三语文化格局中心地位和外语文化的重要作用的同时，民族地区的外语教育应以构建多元文化价值观为其文化追求。

On the other hand, the more important thing is because the urban housing is a kind of heterogeneity products.

另一方面，更重要的是由于城市住房是一种异质性产品。

Climate histogram is the fall that collects place measure calm value, cent serves as cross axle for a few equal interval, the area that the frequency that the value appears according to place is accumulated and becomes will be determined inside each interval, discharge the graph that rise with post, also be called histogram.

气候直方图是将所收集的降水量测定值，分为几个相等的区间作为横轴，并将各区间内所测定值依所出现的次数累积而成的面积，用柱子排起来的图形，也叫做柱状图。