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| площадь сечения | |||
| 断 面面积: 32 phrases in 9 subjects |
| Electronics | 6 |
| Engines | 1 |
| Forestry | 2 |
| General | 5 |
| Geology | 2 |
| Hydrology | 3 |
| Medical | 2 |
| Military | 2 |
| Technology | 9 |
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