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|
echo sounding : 50 phrases in 18 subjects |
| Acoustics | 6 |
| Automated equipment | 1 |
| Cartography | 1 |
| Communications | 1 |
| Electronics | 3 |
| General | 2 |
| Geophysics | 1 |
| Hydroacoustics | 1 |
| Hydrology | 4 |
| Makarov | 3 |
| Metrology | 2 |
| Military | 1 |
| Nautical | 7 |
| Navigation | 6 |
| Physics | 1 |
| Technology | 7 |
| Telecommunications | 1 |
| United Nations | 2 |