绒毛膜绒毛取样(绒毛膜)chorionic villus sampling ( chorion )
抽样大小sampling size
系统取样法systematic sampling
取样sampling
配对选取非比例抽样disproportionate sampling with paired selection【统计】
加严抽样检查tightened sampling inspection【科技】
序贯抽样sequential sampling【计】
分层随机取样法stratified random sampling