 |
| |||
| emergency shaft; reserve well; spare well | |||
| replacement well; standing well | |||
| stand-by well | |||
| 备 用 井: 10 phrases in 5 subjects |
| Drilling | 2 |
| Electronics | 2 |
| Engineering geology | 2 |
| Oil / petroleum | 2 |
| Technology | 2 |
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