... 瞬时取样系统 promptsamplesystem 一回路取样系统 primary sampling system 核取样系统 REN ...
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The present balanced two-layer sample rotation system is applicable only to the monthly survey with two-stage sample designs and with small primary sampling units.
目前的平衡两层次样本轮换模式只适用于一级单元规模较小时的两阶段抽样月度调查。
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