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反循环回转
| 钻
| 反循环回转 | |
| eng.geol. | reverse rotary |
| 钻 | |
| gen. | diamond; jewel |
| dril. | drilling |
| eng.geol. | bit |
| hydroel.st. | bore |
| life.sc. | cobalt |
| met. | borer |
| space | Kobalt |
| sport. | drill |
| |||
| reverse rotary | |||
| 反循环回转: 6 phrases in 4 subjects |
| Bridge construction | 1 |
| Earth sciences | 1 |
| Engineering geology | 3 |
| Technology | 1 |
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