井田境界
- 网络mine field boundary; underground
井田境界井田境界
mine field boundary
煤矿... ... general surface layout of mining area 矿区地面总体布置 mine field boundary 井田境界 mine field size 井田尺寸 ...
underground
...ound)mine field boundary 井田境界 (underground)mine field size 井田尺寸 production scale of mine 矿井井型：按矿井设计 …