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数字记录 系统 : 30 phrases in 11 subjects |
| Aviation | 10 |
| Earth sciences | 2 |
| Economy | 1 |
| Electronics | 5 |
| General | 1 |
| Geophysics | 2 |
| Missiles | 1 |
| Refrigeration | 1 |
| Space | 2 |
| Technology | 4 |
| Wind Energy | 1 |
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