中心的

It means that the city's spatial expansion has not been supported effectively by the transportation system. The polycentric industrial areas and the annularly distributed population do not match spatially.

具体而言，广州市多中心的产业增长和圈层式的人口分布在空间上不匹配，城市未来钟摆式通勤交通的压力将不断加大，而单中心放射状的"双快"交通系统在解决这一问题上是失效的；另外，"双快"系统不利于外围新城市副中心的建设，相反由于与中心城区的快速联系，有可能将大量的人口留在中心城区边缘，给中心城区带来巨大的服务压力。

The results showed that: 1 reinders' redox buffers were used to study the redox properties not only for latent image centers but also for sensitivity centers; 2 The redox potential of Ag2S sensitivity centers was less negative than －220 mV with respect to the saturated calomel electrode in our experiment and the redox potential of latent image centers was between －220 mV and －190 mV; 3 The redox activities of latent image centers were much higher than that of sensitivity centers.

实验结果表明：1Reinders的氧化还原缓冲液的方法，不仅可用于研究潜影中心，也可用于研究敏化中心；2本实验条件下的硫化银敏化中心的氧化还原电位约略负于－220 mV，潜影中心的氧化还原电位值是介于－220 mV与－190 mV之间；3潜影中心的氧化还原活性较敏化中心大得多。

By using the multi-year series of the circulation indices P and C for the closed pressure system on the unit radius spherical surface,three characteristic quantities of annual system centers(around the climatological center C-) are defined.1Average distance r,which is defined as the weighted geometric average distance of the annual system centers C deviating from the climatological center C-(i.e.the center location anomaly C′),is a measurement for distribution area of the system...

用单位半径球面上闭合气压系统环流指数P、C的多年序列，构造了历年系统中心在C-周围分布的3个特征量：1平均距离r，它定义为历年系统中心C偏离于气候中心C-的权重几何平均距离，是系统中心分布区域大小的度量；2压缩系数μ，它描述了历年系统中心分布区域偏离于圆形的程度，是历年系统中心位置分布各向异性的度量；3极大异常方向β，它用系统中心极大异常偏离-C处正东方向的角度，给出了系统中心的主要异常方向。

It is included that 4-5 types of active sites exist in the catalytic system and the active site produced polymer with low molecular weight is easy to be activiated while TEA is used as the cocatalyst. While TIBA, the active site produced polymer with high molecular weight and seldom active site produced polymer with low one is prone to be activiated. MAO tends to activiate the active site produced polymer with middle-level molecular weight. In TEA-TIBA catalytic system, TEA and TIBA activiate the corresponding active site and the weight of every active site gradationally varied with the change of the ratio of the two cocatalysts. And the activity of the active site produced polymer with high molecular weight is proportion to the concentration of TIBA.

发现：TEA作为助催化剂时产生低分子量产物的活性中心易于活化，且体系中具有活性的活性中心有4～5种；TIBA易于活化产生高分子量的活性中心，基本上不能活化产生低分子量产物的活性中心；MAO对产生中等分子量产物的活性中心活化能力较强；在TEA-TIBA混合物体系中，TEA和TIBA各自对活性中心的作用表现为明显的互补现象，各活性中心的相对强度随着两种助催化剂之间的比例改变呈现渐次变化，其中产生高分子量产物的活性中心的相对活性(来源：c5AB3fC论文网www.abclunwen.com)与TIBA的浓度有明显的正相关性。

And then studies on the relevant theories of distribution centers to let everyone know comprehensively, including the concept of logistics and distribution, the concept and development process of distribution center, the classification and function of distribution center, as well as its role. Lately it gives detailed description on the relevant theories of location selection, including the principle and influencing factors of location selection, as well as the steps and general methods of location selection. Finally the paper sums up several methods commonly used at present.

更多配送的概念、配送中心的概念及发展过程、配送中心的分类、功能及其作用；然后研究了配送中心选址的相关理论，包括配送中心的选址原则、影响因素、选址步骤以及配送中心选址的一般方法等部分；最后总结了目前几种常用的选址方法，并在这些理论的基础上，建立了非线性混合0-1规划类型的多配送中心选址模型。

This paper starts from informing construction, researched the problem of ERP construction in PEC...

本文以物探研究中心的信息化建设为出发点，以物探研究中心ERP建设为研究对象，在分析物探研究中心ERP建设现状和存在问题的基础上，借鉴国内外企业ERP建设的成功经验，提出了物探研究中心实施ERP的基本条件和必要条件，进一步提出了物探研究中心ERP建设的对策，包括目标、原则、步骤和策略。

Firstly, the article introduces the definition of error of lens center in the old and new national standard, and summarizes three present systems that can confirm the lens center. Then we discuss the theory and formula of self-collimation catoptric method. On the basis of self-collimation theory, some apparatuses were designed (including internal-focusing center scope and center error measure instrument etc).

首先介绍了新旧国家标准关于透镜中心误差的定义，归纳和总结了目前物镜装校定中心的三个体系，讨论了光学系统中心误差自准反射法测量原理、公式和测量方法，以及根据自准反射法测量原理而设计开发的定中心仪器——内调焦定心仪、中心偏测量仪等设备。

Analyses of the EAWJ seasonal variation and the atmospheric meridional temperature gradient in the mid-upper troposphere indicate that the EAWJ center always corresponds to the largest meridional temperature gradient in the mid-upper troposphere, suggesting that the seasonal variation of EAWJ is a response to the meridional temperature difference.

分析急流与对流层中上层经向温度梯度的季节变化发现，急流出现的位置总是对应着经向温度梯度较大区域，急流中心有随气温南北差异大值中心移动的趋势，急流中心与最大温差中心相对应，表明急流中心的位置变化是对气温南北差异季节变化的响应。

State University and the Chemical (Genomics 染色体组的)Center at N.I.

化学染色体中心的科学家在自然药物期刊上报道了这个发现。

In addition, in-situ infrared spectroscopy provides the information about the nature of the surface acid and base sites. For example, Lewis acid and base sites on metal oxides are coordinatively unsaturated metal cations and oxygen anions, respectively, while Brinsted acid and base sites are the hydroxyl groups on the surface.

结合原位红外光谱，还能够详细地了解表面酸碱中心的性质：金属氧化物表面的Lewis酸中心和碱中心分别是表面配位不饱和的金属离子和氧负离子， Brinsted酸中心和碱中心则是金属氧化物表面的羟基。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。