Method Using stratified random sampling method.
方法采用分层随机抽样方法。
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DESIGN: a stratified random cluster sampling investigation.
设计：分层整群抽样调查。
Methods: Stratified random cluster sampling method was used to determine the survey sample.
方法：以分层随机整群抽样的方法，确定调查样本。
The first 102 mosques and other facilities were chosen on the basis of a stratified random selection.
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