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| 内点 | |||
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inner point : 9 phrases in 8 subjects |
| Compressors | 1 |
| Energy industry | 1 |
| Geophysics | 1 |
| Mechanics | 1 |
| Metallurgy | 1 |
| Nautical | 1 |
| Space | 1 |
| Technology | 2 |
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