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| ring stiffness (кольцевая жесткость трубы CopperKettle) | |||
| кольцевая жёсткость: 14 phrases in 10 subjects |
| Aviation | 1 |
| Building structures | 1 |
| Gas processing plants | 1 |
| Mechanics | 1 |
| Nautical | 2 |
| Oil / petroleum | 1 |
| Oil and gas | 2 |
| Oil and gas technology | 2 |
| Sakhalin | 1 |
| Technology | 2 |