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We generalize the concept of the set of variability defined in the unit diskby K.Strebel to general Riemann surfaces and prove that the set of variablity withrespect to the modulo homotopic class of a quasiconformal mapping between twoRiemann surfaces is a compact and connected subset.Consequently the num-ber of the extremal mappings in the modulo homotopic class of a quasiconformalmapping between two general Riemann surfaces is either one or infinity.

Strebel的定义在单位圆上的可变性集合的概念推广到一般Riemann曲面上去，并且证明了Riemann曲面之间的拟共形映射的模边同伦类所确定的可变性集合是一个连通的紧子集，从而得出一般Riemann曲面之间拟共形映射的模边同伦类中的极值映射要么唯一，要么有无穷多个。

Because of the influence of the planned economy, Chinese media, especially Chinese television have problems in personnel system. The reasonable competition system, hortatory system and providing system are not yet set up. The Newcomers have to accept their position at the bottom of the pecking order. Thus it can hardly make everyone develop his capability completely. The fair environment in which manpower could be distinguished himself is not yet existed. The system which could keep manpower, attract manpower and make him develop his whole capability is not yet set up. The variety problems of the traditional personnel system seriously interfere with the development of Chinese television.

由于受传统计划经济体制的影响，中国传媒业特别是电视业普遍存在着人事制度改革滞后的问题：科学合理的竞争机制、激励机制、分配机制尚未建立，论资排辈现象比较突出，难以做到人尽其才，才尽其用；能使优秀人才脱颖而出的公平环境和留住人、吸引人、使人力发挥自身最大潜能的机制尚未形成等等，存在着诸多问题和种种弊端的传统人事管理制度，严重制约着中国电视业的发展。

Methods : To the hospitalization sufferers who conform to the standard bring into 53 example, according to hospitalize order of sequence, random is divided into the treatment set 27 example, the Matched control set 26 example.

对符合纳入标准的住院患者53例，按照入院的先后次序，随机分为治疗组27例，对照组26例。

If you have a small business with employees, are set up as an S-corp, or have a spouse who works in the business with you, you should set up an HRA.

如果你有一个小型企业与员工，是设立一条S公司，或有配偶者作品，在商业与你，你应该设立一个人权倡导者协会。

Based on the hydrokinetics study of jigging process, the free vibration equations of ideal fluid and actual flow vibration equations have been established. These equations are the theoretical foundation to set the operation parameters and air pressure of the jig. The similar criteria and their related equation of model jig have been deducted by actual flow vibration equation. These similar criteria can be used for parameter transformation between model jig and industrial jig. One set of single cell model jig with measuring system has been constructed in laboratory.

本文通过对跳汰过程的流体动力学研究，建立了跳汰机中理想流体的自由振动方程和实际水流的振动方程，为跳汰机工作制度及风源风压的确定提供了理论依据；利用跳汰机中实际水流的振动方程推导出了跳汰机模型试验的相似准数，建立了模化准则关系式，为工业跳汰机与实验室跳汰机之间的参数转换提供了理论依据；并设计建造了一套实验室单槽模型跳汰机及其实验检测系统，为深入开展跳汰理论的研究创造了条件。

In particular, the system generates bifurcation when 2c-a=0, and then the stable knot bifurcates a hyperbolic saddle point and stable convergence, which is so-called Pitchfork bifurcation. From 2c-a≤0 to 2c-a≥0, the attracting set A of the system is changed from single point to the union set of two different old orbits.

系统在2c-a=0时产生分岔，其稳定的结点分岔出一双曲鞍点和两个稳定的汇，这就是Pitchfork分岔，可见在2c-a≤0变化到2c-a≥0时，吸引集A从单点集变成为连接P和P的两异宿轨道的并。

Each clustered pattern set is a fuzzy set hypersphere with a corresponding membership function. A pattern class is the combination of the pattern sets.

模式集是一个具有超球核的用隶属函数表示的模糊集，模式集又可以合并成模式类。

Methods: Fifty-five male adult SD rats were randomly divided into a normal control group, a saline control group and a heroin dependence group. Heroin-dependent rat models were set up by subcutaneous injection of heroin and the hypophysis were excised on the 10, 17, 24, 31, and 38 days after models were set up. Immunohistochemical SABC method, imagine analysis, and radioimmunoassay were used in the research.

成年雄性SD大鼠55只，随机分为正常对照组、盐水对照组及海洛因依赖组；皮下注射海洛因建立海洛因依赖大鼠模型，分别于模型建立的第10、17、24、31、38天取垂体组织，应用免疫组织化学SABC法、图像分析法观察大鼠垂体远侧部β-内啡肽表达。

For the heavy structure and complex performances of the hybrid system, based on the photovoltaic effect, the state equation of ideal gas, mass and energy conservation equations, physicochemical principles, power transformation relations, flow and transmission of the heat energy, first give a set of proper assumptions and simplifications, then a set of dynamic model of all subsystem are established completely and detailed.

由于PVFC联合发电系统结构复杂，涉及到电化学、传质学、传热学等多门学科知识，以及光生伏打原理、质量守恒、动量守恒、能量守恒、第一热力学定律等多种原理和定律，所以，首先对各子系统在不影响系统性能的基础上进行适当的假设和简化，然后根据各种原理和定律分别建立各子系统的动态数学模型。

Let S_n = Sym be the symmetric group on the set {1, 2,…, n}, T_n is a set of identity element and all transpositions of Sym.

设S_n=Sym是集合{1，2，…，n上的对称群，T_n是由对称群的单位元和所有对换构成。

It has been put forward that there exists single Ball point and double Ball points on the symmetrical connecting-rod curves of equilateral mechanisms.

从鲍尔点的形成原理出发，分析对称连杆曲线上鲍尔点的产生条件，提出等边机构的对称连杆曲线上有单鲍尔点和双鲍尔点。

The factory affiliated to the Group primarily manufactures multiple-purpose pincers, baking kits, knives, scissors, kitchenware, gardening tools and beauty care kits as well as other hardware tools, the annual production value of which reaches US$ 30 million dollars.

集团所属工厂主要生产多用钳、烤具、刀具、剪刀、厨具、花园工具、美容套等五金产品，年生产总值3000万美元，产品价廉物美、选料上乘、质量保证，深受国内外客户的青睐