“二阶抽样”的概念、定义、翻译、参考文献-科学参考

单词	二阶抽样
释义	二阶抽样 Encyclopedia 农学抽样调查释 two-stage sampling二阶抽样设总体由个初级单元组成，每个初级单元又由若干次级单元组成，在总体中按一定方法抽取若干初级单元，对每个被抽中的初级单元再抽取若干次级单元进行调查的方法。
随便看	predicate letter predicate logic predicate logic of first order predicate logic of higher order predicate logic of second order predicate logic with equality predicate modification rule predicate of first level predicate of first order predicate of n arguments predicate of n variables predicate of second level predicate of second order predicate symbol predicate transformer predicate transformer semantics predicate/transition system predicate variable predicate word predicative predicative analysis predicative definition predicative formal theory predicative ordinal number predicative property

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