hard formation
短语词组
- hard shale formation 硬質頁巖層
- medium hard rock formation 中硬巖層
- soft and hard interbeded formation 軟硬互層
- hard turn formation counter attack 同方曏急轉反擊
- abnormal hard tissue formation pulp 牙髓異常硬組織形成
- Abnormal hard tissue formation in pulp 牙髓異常硬組織形成
- hard formation cutting head 硬地層鑽頭
- extra -hard formation 極堅硬地層
- deep well hard formation 深井硬地層 返回 hard formation