representative sampling

Different sampling mode and processing technology should be taken according to different sources and the representative of sample and the samples analysis optimum effect should be insured. At the same time, this paper analyzed season nature and stability of atmosphere granule sources.

根据各种排放源类的不同，须采取不同的采样方式和处理技术，确保样品的代表性和样品分析的最佳效果，同时对颗粒物污染源排放的季节性和季节稳定性作了特征分析。

Through a series of verification, it has been proved that the representative samples can be obtained from manual sampling.

一系列检验证明，人工采样可以获得有代表性的样品。

It is necessary to have an equi-speed sampling for getting a representative soot sample from flue.

为了从烟道中取得有代表性的烟尘样品，需等速采样。

Purpose To solve the problem of sampling within household in resident health survey and generate a representative sample.

目的解决居民健康调查中入户后的抽样问题，产生代表性较好的研究样本。

Methods An equal-sized stratified multi-stage randomly sampling design was applied to obtain three provincially representative sample groups consisted of 720 Guangdong residents each, aged at 12,35-44 and 65-74 years old respectively, with a gender ratio of half to half.

方法采用多阶段分层等容量随机抽样的方法，抽取广东省12岁、35~44岁、65~74岁城乡常住人口各720人，男女各半。