实用的

Climatologically representative retrieval equations for different seasons in Beijing are given, and the numerical simulation tests of the accuracy of retrieval results are also presented. The relative standard deviation of retrieved values of V is 3.1%, 1.6%, 2.2% and 2.4%, respectively, for spring, summer, autumn and winter.

给出了实用的有气候代表性的北京地区4个季节的反演公式，并对反演公式进行了数值检验，分析了反演精度：春、夏、秋、冬4季水汽总量反演的相对标准偏差分别为3.1%、1.6%、2.2%和2.4%。

Hence, a necessary and sufficient condition for the positivity of polynomials of arbitrary degree is presented in this paper. A practical algorithm to express this condition in terms of the coefficients of the polynomials is also given.

由此提出了任意阶多项式为正的一个充要条件，也提出了一个实用的算法，从而可以只用此多项式的系数来表示得到的充要条件。

Although the detection rate has been improving during the last ten years, the speed is still a problem to cumber face detection system from being widely used.

经过20 世纪90 年代以来十多年的发展，人脸检测的精度得到了大幅度的提高，但是速度却一直是阻挠人脸检测走向实用的绊脚石。

Louis Daguerre in France made the first practical version of the silver camera, which is composed of two wooden boxes, insert a wooden box to another box in focus, shutter used as a lens cap, to control for more than 30 minutes of exposure time, can be taken a clear image.

1839年，法国的达盖尔制成了第一台实用的银版照相机，它是由两个木箱组成，把一个木箱插入另一个木箱中进行调焦，用镜头盖作为快门，来控制长达三十分钟的曝光时间，能拍摄出清晰的图像。

MT—1 is a database management system based on dBASE—Ⅱ.It hasa graphic language for data description and manipulation.It is a useful toolfor the development of MISs.

MT—1是在汉字dBASE—Ⅱ的基础上开发的数据库工具软件，它具有图形化的数据描述和数据操纵语言，是一个实用的微机管理信息系统开发工具。

This paper analyzes the investigation results about the internal oxidative corrosion in over 100 fire-tube package boilers and water tube boilers with drums,as well as the causes of the corrosion.Some practical corrosion preventive measures in operation management and deaeration are recommended.

本文对一百多台烟火管快装炉和带锅筒水管锅炉内部氧腐蚀情况的调查结果进行了分析，分析了产生氧腐蚀的原因，从运行管理和采取除氧措施等方面提出了实用的防氧腐蚀的建议。

However, the conventional and applied frequency hopping radios are all designed for the analog or digital speech transmission.

但是传统的和实用的战术跳频电台都是为模拟话或数字话的传输而设计的。

In addition, there is currently no practical method of delivering additional enzyme to the human brain, he said.

此外，他还说目前还没有实用的可将额外的酶传输到人的脑中的方法。

In order to explore the economical practical enzymolysis porcine blood the method, proteases from different sources were studied.

为了探索出经济实用的酶解猪血的方法，对两种不同来源的蛋白酶其采用单一和复合酶水解鲜猪血的酶解效果进行了比较。

It anlysises the connotation and the cause of the ecological risk. Based the research about ecological risk theory, the model of EVR has been established with use of VaR which is a very popular risk man agement model in international market.

系统探讨了生态风险的成因、内涵；结合当前国际上流行的VaR风险管理模型，在生态风险理论有关研究的基础上，建立了一类新颖而实用的区域生态系统风险管理模型－EVR。

This one mode pays close attention to network credence foundation of the businessman very much.

这一模式非常关注商人的网络信用基础。

Cell morphology of bacterial ghost of Pasteurella multocida was observed by scanning electron microscopy and inactivation ratio was estimated by CFU analysi.

扫描电镜观察多杀性巴氏杆菌细菌幽灵和菌落形成单位评价遗传灭活率。