定额抽样
- 与 定额抽样 相关的网络例句 [注：此内容来源于网络，仅供参考]
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Methods:Stratified quota sampling was used to select four communities,representing different community health service models.
采用分层定额抽样方法，抽取 4个不同类型的社区，以入户调查和面对面访谈的方式共调查居民 4 17名，比较贫困居民和普通居民在卫生服务需求和利用方面的差异，并了解他们对家庭病床的认识。
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Methods: This study used quota sampling, and the subjects were patients selected from 10 medical centers which volunteered to participate in the DOH project.
研究对象为10家自愿参与试办计画的医学中心，采用定额抽样方式，受试样本为申请与无申请电子病历两类病患。
- 推荐网络例句
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According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.
曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。
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The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.
稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。
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When I was in school, the rabbi explained everythingin the Bible two different ways.
当我上学的时候，老师解释《圣经》用两种不同的方法。