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| 记录仪深度 | |||
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recorder depth : 60 phrases in 12 subjects |
| Agriculture | 1 |
| Air defense | 1 |
| Business | 1 |
| Engineering geology | 2 |
| Geophysics | 3 |
| Mining | 2 |
| Nautical | 1 |
| Navigation | 2 |
| Oil / petroleum | 4 |
| Shipbuilding | 9 |
| Space | 1 |
| Technology | 33 |
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