优缺点

This paper describes in detail crude benzol hydro-refining process technology and market prospect, expounds the advantages and disadvantages and economic benefit analysis of various crude benzol hydro-refining technology.

摘 要：本文系统的介绍了粗苯加氢精制的工艺技术以及市场前景，阐述了各种粗苯加氢精制技术的优缺点及经济效益分析。

Based on analyzing the generation mechanism and quality characteristics of reclaimed acid from benzol refining and comparing varies kinds of purification methods, the operation easily, the technical process simple extraction method is used to purify the reclaimed acid and the dosage of the extraction agent and extraction power are studied in detail.

对精苯再生酸的生成机理、质量特性进行了分析，通过比较各种再生酸净化方法的优缺点，选用操作简便、工艺简单的再生酸净化方法——萃取法对再生酸进行处理试验，并对萃取剂的用量、萃取能力等进行了详细的研究。

In chapter 5, the design of oscillator is discussed. First introduced the condition of how to make circuit oscillate and keep stabilization. And compared the advantage and shortcoming of design oscillator with S parameter or Bessel Function method.

第五章主要是讨论了射频前端关键模块本振源振荡器的设计，分析了反馈振荡器的起振、平衡条件，比较了用晶体管S参数和时域贝塞尔函数法设计振荡器的优缺点，最后以科尔皮兹型振荡器为例用ADS软件进行设计仿真，给出了设计结果。

The paper shows the structure evolution of bevel and hypoid gear generator as well as its working principles.

介绍螺旋锥齿轮铣齿机的切齿原理和结构演变历程，并对其各自的优缺点进行了比较，为该类机床的设计提供了理论依据。

In this paper, the importance of denitrification in the biogeochemical cycle of nitrogen in estuaries is summarized, It introduces methods of denitrification determination, as well as their advantages and disadvantages.

本文综述了河口区域反硝化作用在N元素生物地球化学循环过程中的重要作用，概述了不同测定反硝化速率的方法，并提出了各种方法的优缺点。总结了反硝化作用的影响因素：O2浓度，NO3，有机质，温度，生物等。

At the same time, according to the biomathematics meaning of this model, it carries on qualitative analysis to the mutually beneficial economic relation among travel industry and other relevant industries for the first time, and then pointing out the pluses and minuses of this method .

同时，根据该模型的生物数学意义，对旅游产业和其他相关产业间的互惠经济关系初次进行定性分析，进而指出该方法的优缺点。

This passage analyzes the advantage and disadvantage of the Boolean Model and the Vector Space Model in information retrieval model: the Boolean Model is simple to realize, but its classification ability is limited and the logic expression formula is strict.

本文分析了信息检索中传统文档特征表示的布尔逻辑模型和向量空间模型的优缺点：布尔逻辑模型虽机制简单、容易实现，但是它的分类能力有限且逻辑表达式过于严格；向量空间模型将文档映射到连续域向量空间，为进一步的权重计算等多元处理提供了基础，但容易忽略文档集合中各个文档的一些共有特征。

Compositions, technology, application parameters of borosilicate glass in LTCC technology were described.

指出了不同硼硅酸盐玻璃材料的优缺点和在低温共烧陶瓷技术中的适用范围。

The merits and defeds of different borosilicate glasses, its application field in LTCC technology were indicated.

指出了不同硼硅酸盐玻璃的材料优缺点和在低温共烧陶瓷技术中的适用范围。

Fist of all, braking system's development, structure and category are shown, and according to the structures, virtues and weakness of drum brake and disc brake, analysis is done.

首先介绍了汽车制动系统的发展、结构、分类，并通过对鼓式制动器和盘式制动器的结构及优缺点进行分析。

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。