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| 回声测深仪 | |||
| 测高计; 声速测深器 | |||
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| 回声测探仪 | |||
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sonic sounder : 9 phrases in 6 subjects |
| Air defense | 1 |
| Construction | 1 |
| Engineering geology | 2 |
| Oil / petroleum | 1 |
| Shipbuilding | 1 |
| Technology | 3 |
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