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样本追加是抽样调查的现实需求,也是一个抽样技术难题。
Sample complementing is the practical demand of sampling survey, and its also a difficult problem in sampling technology.
youdao
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样本追加是抽样调查的现实需求,也是一个抽样技术难题。
Sample complementing is the practical demand of sampling survey, and its also a difficult problem in sampling technology.
youdao