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Based on literatures and our laboratory diagnosis for many samples from different chicken flocks with different symptoms and lesions from different areas nationwidely during the last 4 years,this article analyzed the roles of multiple immunosuppressive viral infections in pathogenesis and epizootiology in chicks flocks.

根据近几年各地大型鸡场不同类型病鸡的实验室鉴别诊断结果，结合国内外的研究进展，本文对不同免疫抑制性病毒多重感染在鸡群疫病发生和流行中的作用做了全面的分析和探索。

The following points are emphasized:The operation models of adiabatic and diabatic distillation have been set up and the operation block, thermodynamics model and mathematical model in the simulation have been determined as well;(2)Based on the simulation and exergy analysis with Aspen Plus program, shortcut distillation design—DSTWU model and rigorous distillation design—RADFRAC model, the author has determined the heat duty, exergy losses and the distribution of exergy losses along the adiabatic column, which will help the simulation and optimization of the diabatic distillation;(3)Diabatic distillation under various operation conditions has been simulated by using energy balance method and exergy analysis;(4)How the different mixture and the various degree of separation, number of trays and feed location influence exergy saving in diabatic distillation have also been discussed;(5)On the basis of the total exergy losses along the column, different schema of the heat transfer distribution along the column have been compared and analyzed;they can be classified in three categories: heat duty equipartition approach, empirical approach, separation degree matching approach. In conclusion, different heat transfer distribution along the column will have effect on total exergy losses. In particular, most satisfactory results have been obtained by using separation degree matching approach. In order to diminish the exergy losses, heat transfer distribution should meet the needs of the request of separation degree.And on this premise, the author makes his suggestion in increasing the proportion of heat supplied to the tray with minimum exergy losses and decreasing the proportion of heat supplied to the tray with the maximum exergy losses.

本文对透热精馏过程进行了模拟并对其节能效果的影响因素做了较为全面的分析和深入的研究，主要研究内容如下：(1)建立了常规精馏和透热精馏过程的模拟操作模块、热力学模型以及数学模型；(2)利用化工模拟软件Aspen Plus并分别采用DSTWU简捷模型和RADFRAC严格计算模型对常规精馏进行模拟计算和有效能分析，确定常规精馏塔的公用工程热负荷、有效能损失及有效能损失在塔内的分布，为透热精馏的模拟和优化提供数据参考；(3)对不同物系在不同分离度条件下进行透热精馏的模拟，分别采用能量衡算法和有效能分析法进行计算和分析；(4)探讨了各种因素如物系的选择、不同分离度、塔板数、进料位置对透热精馏节能效果的影响；(5)以全塔总有效能损失为比较基准，对热量在塔内的三种分布方案即热负荷平均分配法、经验法和分离度匹配法进行了对比分析并得出结论：塔内热量的不同分布方案对于全塔总有效能损失会产生影响，其中以分离度匹配法的节能效果最为理想，为减少有效能的损失，应使塔内的热量分布满足各塔板的分离度要求，并在此前提下，尽量减小有效能损失大的塔板的热负荷和增加有效能损失小的塔板的热负荷。

It reflects esthetic judgements, demands, and ideas of different times, different nations and different countries.

它从不同的侧面、不同的角度反映了不同时代、不同民族、不同国度的审美情趣、审美要求和审美理念。

In the first part we have tried to put forward a definition of the euphony and further to analyze its position in the study of rhetoric; In the second part, the euphony phenomenon has been classified according to different dimensions such as function and culture, etc; In the third part we have given the euphonys characteristics wider coverage to deal with the different reflections in the fields of pronunciation, grammar, semantic meaning and context; In the fourth part, we have analyzed the formation of euphony from the point of aesthetics, psychology, social culture and linguistic characters, etc; Base on what is discussed above the euphony phenomenon both in different folkways and styles of writing have been studied in the fifth and sixth parts; And the final seventh part is the conclusion.

本文分为七个部分：第一部分分析了谐音的定义及其在修辞研究中的地位；第二部分按照功能、文化、性质等标准对各种谐音修辞现象进行了分类；第三部分研究了谐音修辞在语音、语法、语义和语境上表现出的特点；第四部分从语言、心理、美学和社会文化四方面研究了谐音修辞形成的基础；第五和第六两部分分别对民俗民风中的谐音现象和不同文体中的谐音现象进行了研究；第七部分为结语。

Different plant species were used, according to their different adaptation to the environment, in different degrees of eutrophic water.

另外 ，可根据不同植物对环境的各自适应方式将其用于净化不同类型的污水。

This thesis analyzes the energy eigenvalue and of the Harmonic oscillator with a one-dimensional δ-function, makes a comparative study of those of the one-dimensional harmonic oscillator, and analyzes the reason which causes their different quality and the different influences to the eigenvalue of the even parity energy and to the wave function when the number of the "Z" is different.

本文研究了一维δ势场中的谐振子的能量本征值及其本征波函数，并与一维谐振子的能量本征值和波函数进行了比较，分析了它们的性质不同的原因以及取不同势参数Z值时对偶宇称能量本征值和波函数的不同影响。

And we do so for many years with gifts, the experience of the table, you can tailor the design to production, prices of different styles of different needs at different levels to mark the Prestige range of watches.

而且我们结合多年做礼品、纪念表的经验，可为您量身设计制作、价位不同、风格各异适用不同层次需求的多款纪念珍藏手表。

Different tools use slightly different syntax for specifying grammars, and different tools also differ in expressivity and available quantifiers.

对于特定的语法，不同的工具使用的句法略有不同，另外表达方式以及可用的量词也有不同。

Different sedimentary facies with different lithofacies formed in different stages of basin development.

不同的沉积相类型出现在盆地发育的不同阶段，并由不同的岩石相构成。

Only in each of the different stages, at different junctions, we will encounter different people, with your peers for some; after this period, you waved goodbye, and then to the next section of the road, or walk alone, or for a fellow traveler , has completed this process belong to you.

只是在每个不同的阶段，在不同的路口，会遇上不同的人，与你同行一段；过了这一段，你们挥手告别，再迎接下一段旅途，或是独行，或是换一位旅伴，走完属于你们的这一程。

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。