优缺点

The paper conducts comparisons on the technology of constructing WebGIS and domestic and foreign WebGIS software platform;analyzes the advantages and the disadvantages of these technical and these softwares;Introduces Extensible Markup Language XML and its correlation technology, Geography Markup Language GML, the Web service and interoperable agreement that OGC formulates;constructs distributed and interoperable WebGIS prototype system based on web service,realizes the spatial data interoperability, solves the problem of multiple source and isomerism space data share and interoperability.

本文对构建WebGIS的技术和国内外WebGIS软件平台进行了比较，分析了这些技术和软件的优缺点；介绍了可扩展标记语言XML及其相关技术、地理标记语言GML、Web服务和OGC制定的互操作协议；构建了基于Web服务的分布式互操作的WebGIS原型系统，实现了空间数据的互操作，解决了多源异构空间数据的共享与互操作问题。

Some traditional models for smoke prevention and exhaust are analyzed and compared with the smoke-preventing air curtain. The rationality and the feasibility of the air curtain are theoretically expounded.

文中从理论上分析与比较了目前世界各国在高层建筑中所采用的防排烟模式与防烟空气幕的优缺点，从理论上解释了防烟空气幕的合理性与可行性。

Proposing simple evaluation methods and evaluation values are the key factors affecting the popularizing of self-compacting concrete technology. The advantage and disadvantage of several methods for evaluating the workability of self-compacting pumpcrete, such as slump, bleeding under pressure, slump flow, the outpour time of inverse slump cone, the flow speed of Orimet meter,...

探讨了坍落度、压力泌水、扩展值、中边差、倒坍落筒流下时间、Orimet仪的流出速度、L型流动实验等多种评价免振捣泵送混凝土工作性能的指标及其优缺点；经对比分析并结合实验研究和工程实际，提出了实用的新拌免振捣混凝土工作性评价指标及其合理取值区间：坍落度一般应控制在 230~260mm，倒坍流下时间 8~15s，扩展值 600~700mm，中边差值≤25mm，压力泌水实验中的S10不超过 40%， V140在 40~110mL。

Based on the six-wheel mobile robot, research on the robot tumbler joint transmission device has been done. Through comparing various transmission devices, the RV transmission mechanism is studied.

本文以六轮腿自主移动机器人作为研究平台，重点对机器人转臂关节传动装置进行了设计研究，在比较多种传动装置优缺点的基础上，采用RV传动机构作为研究对象。

For each single detection measure or model, there are undetectable intrusion types. To overcome this drawback of single-measure anomaly detector, the two-layer intrusion detection model is provided .

由于每种检测手段都有各自的优缺点，任何一种单独的检测手段或方式都不能够检测出所有的入侵行为。

The first part analyse the academic base of setting up the supervisory board system, this part point out that setting up the supervisory board system show the value concept of protecting security in the Company Law of the People"s Republic of China;setting up the supervisory board system is the embodiment of separation of the three powers which is the in the Company Law of the People"s Republic ofChina;Designing and carrying out the supervisory board system is to solve the problem of entrusting and substitution; the effective running of the supervisory board system is the actual demand for the modem enterprises to solve the problem of powerof control.

首先以英美法系国家独立董事制度和大陆法系国家的监事会制度进行比较，以美、德、日、韩为蓝本，重点考察了大陆法系的监事会制度，介绍了这几个国家监事会制度独有的特色和特点，再在此基础上评述两大监督模式的优缺点，从而得出了公司内部的监督机制，依赖于本国的法律制度、经济背景和文化传统，无所谓谁优谁劣的结论，虽然两大法系的公司监督机制在互相借鉴，但并没有从根本上改变各自的公司权力构架，公司监控机制有效发挥取决于制度设计的合法性、合理性和可操作性。

Study on the Analysis of the Skidding Production Optimization Selection in Southern Collective Forest Regions;2. Study on the Reversal Direction Arisen When 50 Crawler Is Skidding at Steep Slopes;3. Skidding method can be determined by production efficiency and ecological environment.

介绍了目前国内外生态型伐区集材概况及类型，较详细地分析了6种生态型伐区集材模式的优缺点及适用条件，指出中国山地伐区应广泛推广直角横向集材和双向循环索道集材方式。

Design of weld seam tracking fuzzy controlling system with self-adjusting parameters in arc welding;2. The present research status of the weld seam tracking technology was introduced in this paper.

介绍了焊缝跟踪技术的研究现状，分析了用于焊缝检测的传感器工作原理及其优缺点，重点论述了基于机器视觉的焊缝跟踪系统的硬件组成和图像处理的工作流程。

Ccording to the characters of disasters in gas-logged, inflammable and thick seam of coal face, by analyzing and comparing the advantages and disadvantages of the current ventilation method s, a new ventilation method with technique, economy and safety as a whole is brought forward.

针对高瓦期、易自燃厚煤层中高产高效工作面的灾害特征，通过分析比较现有的几种通风方式的优缺点，提出了一种集技术、效益、安全一全化的新型通风方式。

This paper reviews the grinding technology and its development, introduces the structure and working principle of roller press, focuses on the development and classification of grinding process, analyses of the advantages and disadvantages of all different process, and tells how to choose the grinding process.

本文综述了粉磨技术及其发展现状，介绍了辊压机的结构和工作原理，重点介绍了粉磨系统和粉磨工艺的发展及其分类，分析了国内各种不同工艺的优缺点，并给出粉磨工艺的选择方法。

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。