抽样单位

据此，确立了菜心田节肢动物类群多样性的最佳抽样单位、抽样方式和抽样量。

The optimum sampling unit , sampling method and sampling number of arthropod diversity in leafy vegetable field were also determined .

本次调查的基本抽样单位是居委会（城市）和村委会（农村）。

The basic sample unit was neighborhood committee ( city ) and village committee ( countryside ) .

需要被抽样单位协助寄送样品的，被抽样单位应当协助。

Whenever the entity under sampling is required to help forward any sample , it shall offer assistance .

不便于运输的大型设备可现场检验，被抽样单位应配合做好样机的保管工作。

Any large-volume unit inconvenient for transportation may be conducted with field inspection and the entity under sampling shall be cooperative by safekeeping the sample .

以汽车供应商为主要抽样单位，调查问卷共发出166份，回收有效问卷84份，有效问卷率50.6%。

Taking the automotive suppliers as the main samples , 166 questionnaires were issued yielding 84 available returns , and the available questionnaire rate is 50.6 % .

设计：抽样调查。单位：山东省聊城大学教育科学学院心理学实验室。

DESIGN : Sampled investigation SETTING : The Laboratory of Psychology of the College of Education Science of Shandong Liaocheng University .

抽样时，进口单位和海关的人员应当同时在场。

When sampling , the personnel of the import entity and those of the customs shall be on the spot at the same time .

分层抽样就是将总体单位按其属性特征分成若干类型或层，然后在类型或层中随机抽取样本单位。

Stratified sampling is dividing the general unit into several types , or layers , according to the characteristics of their property , from which sample units are randomly selected .

在限额以下贸易业抽样调查中，抽样单位变动频繁，抽样框极不稳定，对抽样估计的精度带来不利的影响。

Because of the frequent changes in the item units to be sampled for enterprises under the quota limit , the sampling frame is rather unstable , which exerts adverse impact on the precision in assessing the samples .

通过随机抽样调查、判断抽样调查和部门单位走访，对浙江省畜禽养殖废弃物现状和区域差异进行了调查分析。

The current situation and regional differences of livestock and poultry waste in Zhejiang province were investigated and analyzed through random sampling , judgment sampling and department visiting .

方法该抽样设计的基础是两级抽样，首先构建一个初级抽样单位（PSU）框架，此框架由流动人群发生的时间和地点组成。

Methods The essence of such designs involves first constructing a sampling frame of primary sample units ( PSU ) that consist of time period / location combinations during which and where the flow takes place .

抽样应当由受过专门培训的专业人员（二人以上）进行，被抽样单位的有关人员必须在场。

The sampling shall be conducted by ( two or more ) professionals who have accepted special training , and the relevant personnel of the sampled entity shall be present at the scene .

本文将多主题抽样调查中各主题间的相关程度分成三类进行了讨论，针对每一种情况，提出了相应的抽样组织形式，目标量的估计方法，抽样单位数和抽样误差的控制方法。

The correlation degrees between subjects in multi-subject sampling survey are discussed in three cases , in view of every condition , the relevant sample orgainzation and the calculating methods of target variable , sample size and sample error are put forward in this thesis .