时间分层分组抽样
time stratified packet sampling
变组分煤层气
Various component coal bed methane
various components coal bed methane
层次可分组设计
hierarchical group divisible design
层析组分
chromatographic component
大型分层视频组播
Large-scale layered video multicast
地层组合控制塌陷分布
strata association and collapse distribution
断层分组出现
appearance of faults in groups
断层组合分析法
fault combination analysis method
分层气流组织
stratified air distribution
分层区组随机化
Stratified blocked randomization