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【简答题】
从一个有限总体中采用非放回式抽样，所得到的样本是简单的随机样本吗？为什么？本课程要求的样本都是随机样本，应当采用哪种抽样方法，获得一随机样本？
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【多选题】下列各具体事项可以用请示行文的有
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