| |||
| 压轮钻头 | |||
| 牙轮钻头 | |||
| ★ 滚轮式钻头; 滚子旋锥; 齿轮钻头 | |||
|
roller bit : 39 phrases in 6 subjects |
| Drilling | 9 |
| Engineering geology | 1 |
| Explosives and Explosive Ordnance Disposal | 1 |
| Mechanics | 4 |
| Oil / petroleum | 9 |
| Technology | 15 |
| |||
| 压轮钻头 | |||
| 牙轮钻头 | |||
| ★ 滚轮式钻头; 滚子旋锥; 齿轮钻头 | |||
|
roller bit : 39 phrases in 6 subjects |
| Drilling | 9 |
| Engineering geology | 1 |
| Explosives and Explosive Ordnance Disposal | 1 |
| Mechanics | 4 |
| Oil / petroleum | 9 |
| Technology | 15 |