It follows by samplingframe and sampling strategy which discuss how to get the correct and precise sample in the study.
通过抽样框架和抽样策略，讨论如何在研究中得到正确准确的样本。
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According to the date of basic units census, this paper designs the samplingframe about the sampling survey of enterprises below designated size in wholesale and retail sale trades.
A fast samplingframe memory of structured light distribution is de- signed, because of the use of large size RAM and preprocessing of the structured light distribution, the circuits is very simple.