DESIGN: a randomized sampling survey.
设计：随机抽样调查。
DESIGN: a cluster sampling and simple randomized sampling survey.
设计：整群抽样与单纯随机抽样。
Method Strata randomized sampling method was used to evaluate nursing documents in the whole hospital.
方法采用分层随机抽样的方法，对全院护理病历进行质量评价。
Methods Air samples were collected by randomized sampling, and detected the hygiene indexes based on Specification for hygiene Management Central Air Conditioning Ventilation System of Public Place.
方法采用随机抽样调查，依据《公共场所集中空调系统卫生规范》对空调系统的通风量、管道积尘等指标进行采样检测。
Methods Air samples were collected by randomized sampling, and detected the hygiene indexes based on Specification for hygiene Management Central Air Conditioning Ventilation System of Public Place.
方法采用随机抽样调查，依据《公共场所集中空调系统卫生规范》对空调系统的通风量、管道积尘等指标进行采样检测。
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