hard formation
短语词组
- hard shale formation 硬质页岩层
- medium hard rock formation 中硬岩层
- soft and hard interbeded formation 软硬互层
- hard turn formation counter attack 同方向急转反击
- abnormal hard tissue formation pulp 牙髓异常硬组织形成
- Abnormal hard tissue formation in pulp 牙髓异常硬组织形成
- hard formation cutting head 硬地层钻头
- extra -hard formation 极坚硬地层
- deep well hard formation 深井硬地层 返回 hard formation