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| 数字记录系统 | |||
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digital recording system : 28 phrases in 10 subjects |
| Air defense | 1 |
| Aviation | 6 |
| Earth sciences | 2 |
| Electronics | 7 |
| Geophysics | 3 |
| Nautical | 1 |
| Refrigeration | 1 |
| Space | 2 |
| Technology | 4 |
| Wind Energy | 1 |
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