比例分布

By comparing the age structure characters of the registered population,Kish table population and the respondent population,the author calculated the theoretical probability distribution of Kish table and found the reason of low proportion of the younger age group in the household sample table and the distorted age structure.

在对比登记人口、Kish选样表人口和被调查人口的年龄结构特点的基础上，分析Kish表的理论概率分布，发现了低龄人口入选比例低和Kish选样表中入选人口与被访者年龄结构扭曲的原因。

The way and principle of the unit method measuring the ratio of different kind of gas emission and the gas concentration distribution were discussed in fully mechanized coalface. The method is simple and feasible in use.

详细论述了单元法测定工作面各种瓦斯涌出源的涌出比例以及瓦斯浓度分布的原理和方法，该方法简单易行，便於推广。

Methods Indicators including frequency of taking different foods, intake of cooking oil/fast foods, intensities of physical activities at work, proportion of taking physical exercises during the day, sedentary life style and BMI were calculated based on results from 17 questions of behavior risk factors surv...

方法应用17个问题，利用2002年普查人口进行加权，计算不同类别人群使用不同类别食物的频率、不同类别的烹调油、食用快餐食品的频度、体力活动的强度、参加体育活动的比例、静坐生活方式和BMI的分布。

It is found that the electric, field improves elongations in 2090 and 2090+Ce alloys markedly, especially in 2090 alloy, but has little effect on strengths. At the same time, the electric field lessenes percentages of intergranular delamination and increases transgranular fracture and microscopic plastic deformation.

研究表明：固溶电场可显著提高2090合金及2090+Ce合金的延伸率，尤其是对2090合金，但对强度则无明显的影响；同时，固溶电场减少合金的沿晶分层断裂比例，并增加穿晶断裂及微区塑性变形；固溶电场还使合金时效后δ′相颗粒的平均尺寸减小、尺寸分布范围减小，并使PFZ的宽度减小。

PVDF/PZT piezocomposite consisting of piezoelectric ceramic and polymer was made according the connection mode, volume fraction ratio or geometric distribution mode.

摘要压电复合材料一般是由压电陶瓷和聚合物基体按照一定的连接方式，一定比例和一定的空间几何分布复合而成。

Unfortunately, accurately quantifying below-ground C fluxes and estimating fine root longevity are still elusive. One of reasons is because we do not know the proportions of shortlived vs. long-lived root pools or the distribution of fine root longevity within these pools.

但是，准确量化地下C通量以及估计细根寿命仍然是目前研究中的难点，其原因之一是因为我们无法确定不同寿命细根间的数量比例关系，抑或说不清楚细根寿命符合何种统计分布。

There were two types of understorey vegetation in eucalypt plantations:shrub-grass type and pure grass type.

桉树林下植被有二种类型：灌木—草本型和纯草本型，前者分布于离地面1.5m范围内，其中灌木占比例为59.6%，草本为40.4%。

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％。