优缺点

Second, Duckbill valve Water Pump Control Valves pros and cons: 1 advantages: Duckbill valve, low cost, such as the use of appropriate rubber material than metal valve service life, easy installation, installation of flexible and diversified ways to repair.

二、鸭嘴阀的优缺点： 1、优点：鸭嘴阀成本低，如采用合适橡胶原料使用寿命超过金属止回阀，安装方便，安装方式灵活多样，可修补。

Methods From January 1995 to July 2006,45 patients of earlobe defect with various size were treated with different methods.

目的探讨用不同方法行耳垂缺损再造修复的可行性及优缺点。

This paper introduced the synthesis technics of low molecular weight bisphenol-A epoxy resin using BPA and ECH,and analyzed their advantages and disadvantages.

介绍了用双酚A和环氧氯丙烷制造低分子量环氧树脂的各种合成工艺，并对各种方法的优缺点进行了分析比较。

Methods of echolocation, pontoon and surveying level by down hole gauge are introduced.

简要介绍了目前常用的回声法、浮筒法和井下压力计探测法探测液面的方法，总结了各自的优缺点和适用范围。

It has important theoretical significance and practical value for promoting level of environmental management and ecotype small town construction.

以海林市2005年实际发展状况为例，通过对比分析指标标准化法、最大隶属度和加权平均三种综合评价的优缺点，筛选与确定加权平均法为最优方法，并验证了本文提出的生态小城镇评价指标体系的可行性。

Based on analysis of traditional static and dynamic Double Edge-Triggered Flip-Flops, a new semi-static DETFF is proposed in this paper.

摘要在分析现有静态结构双边沿触发器和动态结构双边沿触发器优缺点的基础上，该文提出了半静态结构双边沿触发器设计。

The article describes the characteristics in structure of edger stand at rougher area of 2150mm hot continuous mill supplied for Anshan Steel and the merits and shortcomings on the design in comparison with similar edger stands home and abroad.

介绍鞍钢2150mm热连轧机机组粗轧区立辊轧机结构上的特点，同国内外同规格的立辊轧机进行比较，说明该轧机设计上的优缺点。

The main contribution and valuable results of this dissertation can be listed as following:At the beginning, through analyzing the process of color image segmentation and comparing the results of "color image segmentation using fuzzy C-means and eigenspace projections" and "color image segmentation using histogram multithresholding and fusion",the advantages and drawbacks of these two methods are found.

本文研究的主要内容为：首先，对彩色图象分割过程进行分析，并对两种彩色图象分割算法即模糊c-均值和特征空间投影算法、直方图多阈值及融合算法的分割结果进行比较，从算法本身分析了其优缺点。

A survey is made about the principle and application of the renovation of heavy-metal polluted environment on the basis of electrodynamics properties.

在分析地下水中重金属污染物来源的基础上，介绍了采用电动力学性质修复重金属污染环境的原理及其应用方法，对电动力学修复技术的优缺点进行了评价。

Their chemical structures,optical properties and electroluminescence properties were concluded,the characteristics of different polythiophenes were discussed.

对它们的结构、光学性能、电致发光性能进行了归纳和总结，讨论了不同类聚噻吩的特点，对比了随取代基种类、位置及个数的不同其聚合物性能的优缺点，并对其研究和应用前景进行了展望。

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。