bumper sub
短语词组
- bumper r sub 震擊器
- Lubricated fishing bumper sub 閉式下擊器
- long strke bumper sub 長沖程震擊器
- sealed bumper sub 油封式震擊器
- fishing bumper sub 打撈伸縮節;打撈緩沖器
- drill string bumper sub 鑽柱減震器
- surface bumper sub 地麪震擊器
- oil -sealed bumper sub 油封式震擊器
- pressure balanced drilling bumper sub 壓力平衡式鑽井震擊器 返回 bumper sub