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| 背斜的; 穹形的 | |||
| 拱的; 拱顶的 | |||
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сводовое отверстие : 30 phrases in 9 subjects |
| General | 6 |
| Geology | 13 |
| Historical | 1 |
| Metallurgy | 2 |
| Oil and gas technology | 2 |
| Oilfields | 1 |
| Steel production | 1 |
| Technology | 3 |
| Water supply | 1 |
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