分层的

Experiment and flow visualization are conducted in a water-filled cavity which cover the range of Ra=1×10〓----6×10〓 and Pr=3. 3---6. 5. Similarity theorem is applied in analytical investigations. And core region stratification effects to heat transfer are studied. By using scale analysis, temperature and velocity profiles in turbulent natural convection boundary layer are obtained. The results reveals that for turbulent natural convection in enclosures, the bulk of the cavity fluid is essentially statement with thermally stratified temperature and the only substantial motion is that in the boundary layer along four side walls.

在实验方面，作者在高Ra范围内（Ra〓=1×10'~Ra〓=6×10〓，Pr=3.3~6.3）对封闭空间实验台以蒸馏水为介质进行了换热实验与流动显示；在理论分析方面，作者采用相似原理导出了分析解；研究了核心区温度分层规律及其对换热的影响；另外还运用尺度分析法探讨了紊流自然对流边界层温度与速度分布。

Most commonly, it begins with random cluster sampling and then applies simple random sampling or stratified random sampling

最常见的是，从随机整群抽样开始，然后应用简单随机抽样或者分层随机抽样

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 simple random sampling plan and stratified random sampling plan has been introduced and the application means and effects of which also has been presented,it has some characteristics such as material precision and obvious reduce of sample size,and rational advice has been presented.

介绍了简单随机抽样和分层随机抽样方法及其在检测中的应用方法和效果。

The method undertakes to cut complete Qing Dynasty is achieved hemostatic hind, surgical department of applied plastics hairdressing is small achieve principle clip cut, average cut uses fine needle filament statified suture, the cut that the skin is short of caustic applies local skin valve or skin-grafting rehabilitate.

方法对伤口进行彻底清创止血后，应用整形美容外科微创原则修剪伤口，一般的伤口用细针细线分层缝合，有皮肤缺损的伤口应用局部皮瓣或植皮修复。

Side pocket with a snap fastener can be opened and closed easily to get credit cards. Large bills pocket with a zipper give you fully sense of security.

采用分层式构造，侧袋采用可开合暗扣，方便取用银行卡和信用卡，大钞位则为拉链袋设计，给您十足的安全感。

This paper makes a theoretical analysis of the relationship between the social stratification mode and system shift.

本文从理论上分析了社会分层模式变化与制度转型的关系。

MAIN OUTCOME MEASURES: The growth state, stratification and differentiation of cells.

主要观察指标：观察细胞的生长状态及分层和分化状态。

Social stratification is an old and new issue.

社会分层是社会学中一个古老而又常新的话题。

Chinese scholars pay more attention to two aspects of Chinese social stratification.

中国学者研究中国社会分层问题主要集中在两个大的方面。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。