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Animal husbandry
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共同分摊成本
cost-and-benefit-sharing
分层样本
先将群体分成若干类[层],取样时由每类[层]中取出若干个体,使整个样本含有各层按比例的代表
stratified sample
成本效益分析
选择计划方案的一种分析方法
cost-effectiveness analysis
成本效益经济分析
economic cost-benefit analysis
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