进行选择

At first, the rought C〓F〓 mixed gases are obtained by pyrolysis process of R22. A experimental pyrolysis device is designed and made by ourself. The optimum operating conditions are offered in the paper. Secondly, the much efforts is on the synthesis of R134. After through the discussion of basic thermodynamics and kinetics, selecting and preparating catalyst, it is possible that the synthesis of R134 by pyrolyzed gases hydrogenation. Base on the character of catalytic process, the kinetics equation about C〓F〓 catalytic hydrogenation is established. The rate constant of the reaction is obtained through experiment data regression. In order to achieve higher yield of R134, some optimum technological conditions is determined.

论文首先对R22裂解制成四氟乙烯混合原料气的裂解过程进行了讨论，自行设计和制作裂解反应装置，并确定裂解反应的最佳操作条件；然后，重点对R134的合成进行基础研究，分别从热力学和动力学的角度探讨以含四氟乙烯的R22裂解混合气为原料合成R134这一全新工艺的可能性，选择和制备加氢催化剂，根据催化过程特点建立四氟乙烯催化加氢反应的总包动力学方程，并在此基础上自行设计和制作中试合成装置，获得了以裂解混合气为原料合成R134的最佳工艺条件，为R134的工业化生产提供了必要的理论依据和实验基础。

Based on these, the single phase converter system is studied in detail, including the selection of the main circuit scheme, the formation of Sine-wave Pulse- width Modulation signal, the design of the drive and protection circuit of IGBT, and the design of high frequency transformer. Finally, the simulation software is employed to test the effect. And the result is satisfactory.

在此基础上，本文主要对电能质量控制稳定器所需的DC/AC控制电源进行了详细研究，包括主电路方案的选择、SPWM波的生成、IGBT的驱动和保护电路、高频变压器的设计以及闭环电压控制原理，最后进行了输出电压的计算机仿真分析，结果是令人满意的。

"As a minimum, each finished pump shall be performance tested for total dynamic head, capacity, efficiency and power requirements at six operating points plus shut-off head for the selected impeller diameter, of which, the design capacity operating point shall be included."

每一台装配完好的泵至少要在六个工作点上进行性能测试，测试项目至少包括全动力扬程、流量、效率和功率消耗，此外，还要对用于所选择的叶轮直径断流水头的设计流量工作点上进行性能测试。

As a minimum, each finished pump shall be performance tested for total dynamic head, capacity, efficiencyand power requirements at six (6) operating points plus shut-off head for the selected impeller diameter, ofwhich, the design capacity operating point shall be included.

每一台装配完好的泵至少要在六（6）个工作点上进行性能测试，测试项目至少包括全动力扬程、流量、效率和功率消耗，此外，还要对用于所选择的叶轮直径断流水头的设计流量工作点上进行性能测试。

The effects of opening size as well as cone angle on cavitation intensity in the water hydraulic poppet valve were numerically investigated.

为了抑制阀口气穴，对锥阀阀芯形状进行了改进，选择了几种不同的阀芯形状，并分别进行了气穴流场分析和比较，从而获得了优化的阀芯结构形状和尺寸。

Methods 40 patients preparing to take orthodontic treatment were selected , standardized lateral cephalograms and facial photograms were taken for each patients.6 angles were studied in both cephalograms and photograms.

选择正畸门诊病例40名，应用Photoshop软件对其侧面像进行定点测量，将所得数值与通过常规头影测量所得数值进行对比研究。

The purposes of this work reported here are selecting the optimal refrigerant charge in a residential cool cabinet,and the influence of refrigerant charge on system properties such as evaporator pressure, condenser pressure,temperature distribution in evaporator coil and the on off cycle length are analyzed.

对一台小型冷柜系统进行了选择最佳充注量的实验研究，讨论了充注量的多少对蒸发压力、冷凝压力、蒸发器温度分布、压缩机开停机时间等方面的影响，得到了耗电量最少的充注量，并对此条件下的循环特点进行了理论分析。

Marketing study is to divide the market,then choose the target market then decide the difference between own product and the others,thus quasi- oneself of market fixed position.

营销学是对市场进行区域划分，即市场细分以后，进行目标市场的选择，然后确定自己产品的差异化，从而找准自己的市场定位。

This system ofcompatible electromagnetism of frequency spectrum has someimportant functions listed as follows:(1) Analysis disturbance of the same or adjacent frequencies (2) Analysis of performance of radio link (3) Analysis of intermodulation (4) Automatic selection of frequency(auxiliary assignment of frequency)(5) Prediction of region of radio field intensity (6) Harmonization of frequency border (7) Analysis and design the system of microwave and satellite earth station.(8) Generate photographs This paper realizes the function of harmonization analysis ofthe system of microwave and satellite earth station. The concretework includes:(1) Based on the propagation model of radio wave,computing the absorption loss of atmosphere of microwavecommunication system and its fading, simulating the receivingvoltage and realizing the computation of disturbance andharmonization between microwave station and earth station.

频谱电磁兼容分析系统主要实现以下几个功能：⑴同、邻频干扰分析⑵无线链路性能分析⑶互调分析⑷频率自动选择⑸场强覆盖预测⑹边界协调⑺微波与卫星地球站系统设计和干扰协调分析⑻图形制作功能本文做为全省建设的电磁兼容分析系统的一部分，实现了微波站与地球站干扰协调分析这一功能，具体有：⑴以无线电波自由空间传播为模型，对微波通信系统的大气吸收损耗和衰落储备量进行了计算、对接收电平进行了模拟仿真，实现了微波- I -吉林大学硕士学位论文 Abstract站与地球站之间的干扰与协调计算。

This thesis first re-explain the application ofgovernmental accounting according to the subject postulates of the four basis postulates, and suggest that the viewpoint of differentiating accounting recording subject and reporting subject and makes some suggestions how to establish the reporting subject in the Chinese government . Secondly, this thesis puts forward a viewpoint that we should take basis of accounting as a basic postulates of government accounting, and an analysis on the initializing mechanism and realization mechanism of governmental accounting worldwide, and last this thesis makes some suggestions on the Choice base of Chinese governmental accounting.

首先对现有四个基本假设中的主体假设在政府会计中的应用进行重新解释，提出区分记账主体和报告主体的观点以及对如何确立中国政府会计的报告主体提出建议：其次，主张将会计基础作为政府会计的一项基本假设，并结合国际社会政府会计实践对政府会计运用权责发生制和收付实现制进行了分析，提出中国政府会计基础选择的若干建议。

Neither the killing of Mr Zarqawi nor any breakthrough on the political front will stop the insurgency and the fratricidal murders in their tracks.

在对危险的南部地区访问时，他斥责什叶派民兵领导人对中央集权的挑衅行为。

In fact,I've got him on the satellite mobile right now.

实际上 我们已接通卫星可视电话了