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For better understanding life state of middle class, according to ""Quality of Life of Urban Residents"" I have drawn the middle class' relevant data from it, has analyzed the life state of the Chinese middle class with the figure, and has introduced the characteristic of the Chinese middle class simply.

为了更好的了解中产阶层的生活状况，笔者根据"中国城市居民生活质量调查"，从中提取了中产阶层的相关数据，用数字解析了中国中产阶层的生活状况，并简略介绍了中国中产阶层的特征。

After studying of modern pedagogy and modern psychology, and after experiencing the participation pedagogy, and in view of the fact of the characteristic of math teaching in class of kindergartener, the scheme method of combining the traditional teaching mode with the participation pedagogy have been put forward in this paper.

在这一思想的指导下，幼师数学教学中形成了教师与学生参与式教学的四个层次，在使用参与式教学法时提出了对教师与学生的具体要求，对数学概念课进行了参与式教学法设计，并对准备导入环节的设计以及例题课教学的设计等做了较详细的阐述。

Secondly, in the experiment, the characteristic of flux and spray cone of the nozzle is measured and analyzed. Two different kinds of packing, metal and plastic, is applied to evaluate the performance of the saturator. After comparison between the two, it can conclude that metal packing is better than plastic packing in all aspects, and more suitable for high pressure and temperature conditions.

其次，在实验中，测量和分析了喷嘴流量和雾化角的特性，应用金属和塑料两种填料对饱和器进行了实验研究，对比了两种不同填料的性能，发现金属填料比塑料填料具有更好的流体力学和传热传质性能，更适合于饱和器的压力和温度环境。

How does the angular error produced by manufacture affect the reflective characteristic of moving angular cone prism?

角度误差对运动角锥棱镜反射特性有何影响，国内未见报导。

The experiments show that friction characteristic of cone flange bearings with unmodified roller ends is better than commercial bearings after running-in.

实验结果表明，挡边加工成锥面，滚子端面不做任何改动的轴承，摩擦特性明显优于充分跑合后的普通轴承。

Moreover, the inner cone has the characteristic of Lewis basis with high electron density because of the lone-pair electrons of oxygen atoms stretching towards it and can form inclusive compounds with varied compounds. The special structure of CD is very important to separate and analyze enantiomers, which has become the most important mainbody of super-molecular chemistry and greatly improved the developments of bioscience and pharmaceutical chemistry.

环上具有多羟基，具有亲水性。O原子的孤对电子朝向内腔，使内腔具有高的电子密度，具有Lewis碱的特征，能和多种化合物形成包合物，这种结构因素在手性识别上起作用，目前它已经发展成为超分子化学最重要的主体，对促进生命科学和药物科学的发展具有重大意义。

Chapter 4 firstly analyses the generation mechanics, calculating method and interference effect of flow force in the outflowing large-capacity proportional valve. Then it not only presents a structural design to compensate the flow force according to the performance characteristic of the cone valve, but also calculates and simulates the flow field at the valve port through CFD software Fluent6.0. At last it studies the influence of compensation structure parameters and obtains better projected dimensions.

第四章主要阐述了电液大流量控制阀的液动力产生机理，计算及其对系统的干扰作用，在此基础上针对该阀的结构和工作特点提出阀芯所受液动力的补偿方法和结构，然后对阀口处的流场进行了有限元仿真计算，探索了液动力大小与补偿结构的各参数之间的关系，最后得出能实现液动力补偿的合理结构。

Then the location characteristic of the FDOA curve and the error of the FDOAlocation have been analyzed and simulated respectively.

并对到达频差曲线的定位特性和到达频差定位的误差进行了分析和仿真。

The second part is the computational methods of the determinant: This part is core part in the full text, and mainly studied 14 kinds computational methods which nearly covered each kind of the characteristic of the determinant computation, including the definition method, the triangle method, Canada method and so on.

第二部分为行列式的计算方法：这一部分是全文的核心部分，主要研究了几乎覆盖各种特征的行列式计算的十四种重要方法，包括定义法、三角形法、加边法等，它们为我们计算行列式提供了方便快捷的途径。

The Computer-aided method also exploits the characteristic of linear differential equation with two additional approximations.

计算机辅助法也充分利用了线性微分方程的特点及另外两个合理的近似条件。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。