multistage sampling [统计] 多级抽样 ; 多阶抽样 ; 多段取样法

multistage stratified random sampling [统计] 多级分层随机抽样

stratified multistage sampling 分层多级抽样

multistage data sampling 多阶段数据取样

multistage mixed sampling 多级混合抽样

aerial photo multistage sampling 航空像片多阶抽样法

two-stage and multistage sampling 两阶和多阶抽样

stratified multistage cluster sampling 分层多级整群抽样

multistage and random sampling 多阶段随机抽样