查询词典 stratified sample

The propagation matrix method used widely in stratified media is extended to laterally inho-mogeneous media,and a numerical method known as generalized propagation matrix method for simulating elastic seismic wave propagation in inhomogeneous media is presented by using mixed variable elastic wave equation and matrix exponent solution of system of linear ordinary differential equations.

应用混合变量弹性动力学方程和线性常微分方程组的矩阵指数解法，将层状介质中广泛应用的弹性波传播矩阵解法推广至横向非均匀介质，给出了一种可计算复杂地质体中弹性波传播的广义传播矩阵数值解法。

The main research and application result is: five dynamic sampling frames with spatial autocorrelation analysis are achieved such as high-high, low-low, high-low, low-high and not significant, and finally the result of per capita agricultural total output value of Beijing with spatial stratified sampling technique is 35.80 thousand Yuan RMB, with the sampling error range is ±3.861 thousand Yuan RMB.

其结果为：动态生成"高－高集聚"、"低－低集聚"、"高－低集聚"、"低－高集聚"和"分布不明显"5个抽样框，并最终通过空间分层抽样流程得到北京市人均农业总产值的抽样调查结果为3.580万元，抽样误差的允许范围为±0.3861万元。

As a result, parts of the dust cloud have become stratified, pointing toward Merope. The closest particles are the most massive and the least affected by the radiation pressure. A longer-term result will be the general destruction of the dust by the energetic starlight.

因此，部份尘埃云形成指向昴宿五的层状结构，最靠近昴宿五的尘埃粒质量也最大，因为它们受到辐射压的影响最小，更长期的效应是尘埃微粒会被高能量星光给全部破坏。

It shows a stratified mesophyll.

它显示出分层的叶肉组织。

This provides theoretical foundation to judge a stratified flow or mixed flow in practical engineering problem.

为工程应用中判断燃烧器出口流场分层与否提供了理论依据。

Most human settlements, like all landscapes, are stratified, spatially and temporally: streets and buildings over underground sewers and basements; multistoried houses with street-level common rooms for entertaining visitors and second floor private rooms; penthouses on upper floors of skyscrapers.

绝大多数人类聚居地，就像所有的景观空间和时间上有层次、街道、建筑在地下：下水道、地下室、多层住宅和街道公共休息室的娱乐访客和二层包房，复式公寓楼上的摩天大楼。

In this study, stratified sampling is in Shandong Province and Ningxia Hui Municipality.

本研究在宁夏回族自治区的3个县和山东省的3个县进行调查和分析。

The RL is neutrally stratified, resulting in turbulence that is nearly of equal intensity in all directions.

停留层是中立地分层的，于是产生了近乎所有方向的相等集中度的骚乱。

Nine thousand two hundred and seven subjects were selected by stratified sampling.

本研究的调查问卷经专家学者拟订，共有十二道题目。

Patients were stratified by PS, stage and prior pancreatectomy, and randomized to either G alone or G plus C.

入组时根据患者PS状态、分期和既往是否行胰腺切除术进行分层，患者随机进入吉西他滨单药或吉西他滨加C225组。

Cable dampener cannot be rolled up but must be hung over the cable.

缆帆不能被卷起，必须保证处于展开状态

"This skylark is a present from my master," he says.

"这只云雀是我主人献上的礼物。"他说。