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Choose the 890nm infrared LED as the light source after compared the capabilities of incandescent lamp/tungstic lamp and LED/LD and also think about the selective absorbability of water; it has strong points such as constant light intensity,long life, narrow light spectrum,etc, and use the infrared light with 890nm wavelength to decrease the influence of optical-absorption matters.Choose the photosensitive diode which suitable to the LED which we choosed after compare the capabilities of light sensitive resistor, photocell, photosensitive diode and phototriode. Both of these make up the photoelectric system of turbidimeter.

通过比较白炽灯／钨灯和发光二极管／激光二极管的各项性能指标，考虑到水对光线具有选择性吸收作用，选择890nm的红外发光二极管作为浊度仪的发光器件，其有发光光强稳定、寿命长、发光光谱窄等优点，且用波长大于800nm的红外光进行测量可以大大减小水中光吸收物质的影响；通过对光敏电阻、光电池、光敏二极管和光敏三极管等光敏器件的各项性能的分析与比较，选择响应时间短、输出特性线性度好的光敏二极管作为光接收器件，并与红外发光二极管相配套，构成浊度仪工作的重要系统——光电系统。

Id=xxx turns through jumping, basically do not have action to his website so, still have a plenty of what will call through IFRAME, here I remind everybody, still 2 kinds compare dreariness, one kind is the website is optimized, another kind is more the method of Lilliputian, when you detect with software software also can hint you have a link, but what action also is done not have, the reason is to do not have anchorage text, for instance, does everybody say this kind of code is useful?

id=xxx就是通过跳转的，这样对自己的网站基本上没有作用，还有的是通过IFRAME来调用的，在此我提醒大家一下，还有二种比较可怕的，一种是网站优化，另一种则是更小人的方法，当你用软件检测的时候软件也会提示你是有链接的，可是什么作用也没有，原因是没有锚文本，比如，各位说说这种代码有用吗？

This value is used to compare the strength of materials, but a safety factor is applied when making design calculations, to bring the working stress well below the limit of proportionality.

此值被用来比较材料的强度，但是当设计计算时，要用一个安全系数，使工作应力低于比例限制。

There is shameless lout in each places, being like the Chin Hua, north to also have greatly, is the student who these so-called and high etc. universities come out even if, I want to also not necessarily compare us north China the student of science and technology college is strong.

每一个地方都有败类，就像清华、北大也有，即便是这些所谓的高等学府出来的学生，我想也不一定就比我们华北科技学院的学生强。

In order to detect the lutein content in plants by HPLC,different pre-treatment methods were used to compare the effect of the extraction.

采用高效液相色谱分析方法分析测定植物样品中的叶黄素含量，对不同的前处理方法进行了实验。

The research aimed to compare the scavenging abilities of total flavone from Lygodium japonicum with different solvents to free radical activity.

［目的］比较不同溶剂提取海金沙总黄酮对自由基活性清除能力的大小。

Methods choose 520 lying-in women in our hospital(july 2003～january 2005)to make the whole process accompanies delivering into practice,as observation group.at the same time,choose 178 lying-in women received our service from january to june in 2003,as control group.then observe and compare the two groups in psychology status of the lying-in women,delivery mode,as well as the syndrome during and after vaginal delivery.

将在我院住院分娩的520例产妇(2003年7月～2005年1月)实施全程陪伴分娩，并作为观察组。将178例(2003年1～6月)传统分娩护理的产妇作为对照组，观察对比两组产妇的心理状况、分娩方式以及母婴产时产后并发症情况。

You also want to make sure you hold on to receipts and compare them with your credit card statement.

你也要让你肯定坚持对收益比较一下你的信用卡帐单。

They have one thing in common: compare the development of human society to the process of human beings growing up, to demonstrate the periodically changing of scoiety, then conclude the process as three times, also called "three stages" in Manicheism.

就是说人类社会也是呈周期性变化的，在一个大的周期中基本分三个阶段，也有摩尼教称为"三际"。

In the experiment the pre-processings, such as image filtering and Harris operator corner detector, etc. were used to get feature points quickly and realize the mapping transformation of camera parameters. The error estimate function was established to compare the proposed method with Tsai calibration algorithm.

实验过程中，利用图像降噪、改进的Harris算子角点提取等预处理过程快速提取特征点，实现摄像机参数标定的映射变换；建立了误差评价函数评价本文方法与Tsai标定算法。

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。