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| depth sounder | |||
| 探深器: 23 phrases in 9 subjects |
| Agriculture | 1 |
| Air defense | 1 |
| Earth sciences | 4 |
| Engineering geology | 1 |
| Nautical | 1 |
| Navigation | 1 |
| Oil / petroleum | 4 |
| Space | 2 |
| Technology | 8 |
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