查询词典 stratified sample

This might be because Yoruba society is highly patriarchal and stratified, producing a lot of social pressure for genetically similar men and women to mate.

这可能是因为约鲁巴社会是高度族长集权和等级森严的，从而给基因相近的男女结合造成了很大的社会压力。

Methods Thirty-two New Zeeland rabbits were randomly assigned into two groups as experiment group (n=24) end control group (n=8). Each rabbit in experiment group was given injection with 8.0 mg/kg of hydrocortisone acetate for two times per week, while rabbits in control group were given normal saline in same quantity. Serum glucocorticoid concentration, total cholesterol and triglyceride were determined respectively before and 2, 4, 6 and 8 weeks after treatment. Rabbits were sacrificed at the 2nd, 4th, 6th and 8th week. The rabbits, sacrificed at the same time point, were stratified into group A and group B according to the GC concentration, in an attempt to observe the rate of empty bone lacuna and glucocorticoid receptor expression in the soft tissue around hips.

32只新西兰大白兔随机分成两组：实验组(n=24)每周2次肌注醋酸氢化可的松注射液8.0mg/kg造模，对照组(n=8)每周2次肌注等量生理盐水各组于处理的0、2、4、6、8周抽血测定空腹血清GC血药浓度及而清总胆固醇、甘油三脂水平，并于第2、4、6、8周分批处死动物，将同批处死的实验组动物依据血清GC浓度分为A、B两组，观察股骨头的空骨陷窝率及髋周软组织中糖皮质激素受体的表达。

Methods 27 species of Acaroid mites were isolated from 19 grain species in 3 groups of grain stocks with the stratified sampling; Two fuzzy matrixes was founded for classification.

方法从 19种粮食中分离出的粉螨经软划分法建立模糊相似矩阵后，采用直接编网分类和带权重αi 编网分类。

Being stratified by gender factors, the CRC risk in females with homozygous W/W or Mx/W+W/W fast acetylators increased 2.47- and 2.13-fold compared to those with the Mx/Mx slow acetylator genotype (95% CI 1.27-4.82 for W/W genotype; 95% CI 1.17-3.89 for Mx/W+W/W genotype), however, the risk of the NAT2 genotype and CRC was not observed in males.

但在 W/Mx NAT2慢速代谢基因型与Mx/W+W/W快代谢基因型则无差异。若将性别分开分析时发现，女性具有NAT2 W/W homozygous 或 Mx/W+W/W快速代谢基因型发生大肠直肠癌的危险性是Mx/Mx慢速代谢基因型的2.47倍及2.13倍，但在男性则没有观察到 NAT2 基因型与大肠直肠癌的相关性。

Germination percentage of M. adenophora seeds increased to approximately 50% by exogenous application of GA3 at 1000-2000ppm. Furthermore, germination at seeds stratified at 30/20℃ for 4 weeks followed by GA3 treatment increased to 68%.

新鲜的恒春杨梅种子经激勃素GA3 1000-2000ppm处理，可增加发芽率至50%左右，若种子先经30/20℃变温层积4星期，然后再用GA3处理，发芽率可达到68%。

The ore have disseminated structure, stratified structure, stipped structure, lamellar structure, vein structure and brecciated structure.

矿石构造主要有浸染状构造、层块状构造，其次为条带状构造、层纹状构造、脉状构造、角砾状构造。

And loess mass structures are divided into four types as homogeneous, stratified, columnar, blocky and cloddy pulverescent structures based on the sedimentation characteristics of loess, features of structural planes and range of engineering loess mass.

依据黄土的沉积特点、结构面的特征和工程黄土体的范围将黄土体结构分为均质结构、层状结构、柱状结构、块裂结构和碎裂结构。

In Pattern less casting manufacturing technology by using the disperse/cumuli prototyping principle of rapid manufacturing and resin sand moulding material, the three dimensional CAD model is stratified, sliced, the information of different high section are obtained, then these section are scaned, jet solidify, the resin sand prototyping or casting model is direct obtained.

无模铸型制造技术是以树脂砂为成型材料，利用快速成型技术的离散／堆积成型原理，对三维CAD实体模型进行分层切片处理，得到不同高度截面层的信息，采用截面扫描、喷射固化工艺，直接获得树脂砂铸型或铸造模具的一种方法。

Methods Through questionnaires,the annual number of X-ray diagnostic examination of the whole province was investigated,according to it,hospitals were arranged decreasingly into four levels,and proceeded the stratified random sampling on the rations of

阳性率是判断X射线诊断检查应用是否符合合理应用原则的重要指标之一。X射线诊断检查的阳性率应保持在一个合理的水平上，如果阳性率过低，表明无临床意义的X射线诊断检查的应用过多，应当采取措施予以限制。

To assess this hypothesis, we studied sleep characteristics in 21 patients with ALS, stratified according to the presence or absence of diaphragmatic dysfunction.

本文对这一假设进行验证。方法：研究21例ALS患者的睡眠特征，依据有无膈肌功能紊乱进行分析。

I can do simple painting, carpentry and plumbing.

我能做简单的油漆、木工和修水管等工作。

The motivations, notations and outline of this work are also given in this chapter.

从这个意义上讲，这些时滞是无害的。然后用实例说明这三个定理的应用和互不包含性。