... stratified sampling 分层抽样 stratified selection 分层抽样 stratum 层 ...
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stratified mass selection 分层群选
stratified ma selection 分层群选
stratified d mass selection 分层群选
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The first 102 mosques and other facilities were chosen on the basis of a stratified random selection.
CENTERFORSECURITYPOLICY: New Shariah study documents Islamist threat
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