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偶遇抽样
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偶遇抽样
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accidental sampling
偶遇抽样
研究者根据实际情况,为方便开展工作,选择偶然遇到的人作为调查对象,或者仅选择离得最近、最容易找到的人作为调查对象,又称便利抽样。
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agricultural utilization of sewage sludge
agricultural utilization of sludge
agricultural virtual water trade
agricultural visualization
agricultural warehouse
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agricultural waste treatments
agricultural wastewater
Agricultural Water Management
agricultural water pollution
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agricultural wind energy resources
agricultural wireless sensor network
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Agriculture and industrialization
agriculture as the foundation of the national economy
agriculture census
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