“two-phase sampling”的概念、定义、翻译、参考文献-科学参考

单词	two-phase sampling
释义	two-phase sampling Mathematics ＞数理统计＞抽样与统计过程控制＞释义 two-phase sampling二相抽样 two-phase sampling双重抽样^†，二相抽样
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