[礦業(yè)] 分層取樣法 stratified random sampling method: 分層隨機(jī)抽樣法stratified sampling method: 分層抽樣法sampling stratified: 分層抽樣stratified sampling: 成層抽樣; 分層抽樣品; 分層取樣area stratified sampling: 區(qū)域分層抽樣下載手機(jī)詞典可隨時(shí)隨地查詞查翻譯