tapered string
| of
| drill pipe
| tapered string | |
| oil | 变径管柱; 塔式钻柱 |
| of | |
| gen. | 的; …的; 关于 …的; …做成 的; 对…; … 的 |
| drill pipe | |
| bridg.constr. | 钻管 |
| |||
| 变径管柱; 塔式钻柱 | |||
|
tapered string : 16 phrases in 3 subjects |
| Drilling | 3 |
| Oil / petroleum | 8 |
| Technology | 5 |