DESIGN: a simple random sampling survey.

设计：简单随机抽样调查。

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After perfect questionnaire we get performance data by a large sampling survey.

根据评价结果完善问卷并进行大样本调查，得到绩效数据。

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After perfect questionnaire we get performance data by a large sampling survey.

根据评价结果完善问卷并进行大样本调查，得到绩效数据。

youdao