取样

Simple random sampling is the case where n objects are selected at random from a population, and each member of the population is equally likely to be included in the sample.

简单随机抽样是指从总体中随机取样n次，使得总体中的每个元素在样本中的出现的可能性相同。

In principle, layered random sampling and simple random sampling were used.

取样原则采分层随机抽样和简单随机抽样方式，共抽取12所学校，抽样得70个班级，含68位教师与其班级学生共754人，回收的有效样本共计70班，合计68位级任教师与739位学生。

The ability to detect and isolate the virus in the early phase of the disease may be an important diagnostic tool for future patients and tear sampling is both simple and easily repeatable.

在非典早期检出并分离出冠状非典病毒，是对未来非典病人的一个重要诊断工具。而眼泪取样既简单，又容易重复进行。

The low phase shift error is critical for measurement of non sinusoidal wave shapes, as found in power quality or sampling digital wattmeter measurement applications.

低相移误差是至关重要的衡量非正弦波形状，在电能质量或取样数字瓦特计测量应用。

The herbaceous Smilax species form a monophyletic clade, and it is also the case for the South American species. Their positions in the cladogram are intriguing and may help to shed light on evolutionary and biogeographic history of the family.

Nemexia的单系得到很好的支持(93％)；(4)分布于南美洲巴西的种类聚为一个单系类群，表明它们可能有共同的起源，但由于取样局限，南美洲种类的系统地位有待进一步研究。

We studied a free ranging provisioned group of the Sichuan snub-nosed monkey in their natural habitats.

2000年9月到2003年3月共计197天的时间里，我们采用目标动物取样法和行为的全事件记录法对一群生活在秦岭北坡周至保护区内的秦岭金丝猴在自然栖息地内空间利用的进行了研究。

Available features: Auto-Trim, Crop, Deskew, Flip, Mirror, Resample, Resize, Rotate, Shear, Add Noise, Anti-Alias, Average, Bending, Border Remove, Brightness, Buttonize, Color Resolution, Colored Gray, Contour, Contrast, Cylindrical, Despeckle, Dilate, Dot Remove, DPI Resolution, Edge Detector, Emboss, Erode, Etch, Gamma Correct, Gaussian Blur, Glow, Gradient, Grayscale, Half-Tone, HistoContrast, Hole Punch Remove, Hue, Impressionist, Intensity Detect, Invert, Invert Text, Laplacian, Line Remove, Line Segment, Max Filter, Median, Min Filter, Mosaic, Motion Blur, Multiply, Oilify, Old Photo, Pixelate, Polar, Posterize, Prewitt, Punch, Radial Wave, Ripple, Saturation, Sharpen, Smooth, Sobel, Solarize, Swirl, Unsharp, Wave, and more!

可用的功能：自动修剪，作物， deskew ，倒装，是一面镜子，重新取样，大小，旋转，剪切，添加噪音，抗混叠，平均而言，弯曲，边界消除，亮度， buttonize ，色彩解析度，色灰，轮廓，对比度，圆筒形， despeckle ，扩张，点删除， dpi解析度，边缘检测， emboss ，侵蚀，腐蚀， Gamma修正，高斯模糊，辉光，梯度，灰阶，半色调， histocontrast ，孔冲床删除，色调，印象派，强度检测，反转，反转文本，拉普拉斯，删除线，线段，最高过滤器，中位数，闵过滤器，马赛克，运动模糊，乘， oilify ，旧照片， pixelate ，极地， posterize ， prewitt ，冲床，径向波，涟漪，饱和度，锐化，平滑，索贝尔，曝光，漩涡，锐化，波浪，及其他更多功能！

The probe of the space shuttle got a lot of soil samples of the moon.

宇宙飞船的取样器收集到很多月球的土壤样品。

Spectrometric Oil Analysis is one of the important methods of equipment condition monitoring.

光谱油料分析技术是对机械设备实施状态监测和故障诊断的重要手段，其应用成功与否的关键在于取样的规范性及光谱油料分析故障诊断的理论和方法是否。。。

Methods The necrophagous fly L. sericata were reared at constant temperature of 20 ℃, 24 ℃ and 28 ℃ respectively and were tempted to lay eggs with lean pork. One Sample was taken at 12 h intervals till 50% of the larvae were in pupae stage. Then, the anterior spiracle, posterior spiracle and cephalopharyngeal skeleton were investigated through digital image processing combined with morphologic observation.

在20 ℃、24 ℃和28 ℃下饲养丝光绿蝇，瘦猪肉诱其产卵，每隔12 h取样1次，直至50%以上幼虫化蛹为止，采用形态观察与图像分析相结合的方法对幼虫前气门、后气门、头咽骨进行观察研究。

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。