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| casing head gas | |||
| bradenhead gas; well head gas | |||
| casing-head gas (体); well-head gas (体) | |||
| 井口气: 8 phrases in 5 subjects |
| Drilling | 3 |
| Economy | 1 |
| Engineering geology | 1 |
| Oil / petroleum | 2 |
| Technology | 1 |
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