草地大面积估产
grassland large area yield estimation
超大面积深基坑
super large deep excavation
super large excavation
Large-scale Deep Foundation Pit
大面积α、β污染测量仪
large area surface monitor for α β contamination
大面积α闪烁计数器
large area α scintillation counter
filter efficiency
大面积充填采矿
large range filling mining
大面积出土口
large size access openings
大面积弹着点测量系统
large area bullet impact location measuring system