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| oil-well pipe; oil-well tubing | |||
| oil country tubular goods | |||
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油井管 : 81 phrases in 11 subjects |
| Business | 1 |
| Drilling | 5 |
| Earth sciences | 5 |
| Engineering geology | 1 |
| Geophysics | 11 |
| Mechanics | 3 |
| Metallurgy | 3 |
| Mining | 10 |
| Navigation | 1 |
| Oil / petroleum | 30 |
| Technology | 11 |
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