 |
| |||
| echo sounding apparatus | |||
| acoustic seeker | |||
| sonic echo sounder | |||
| acoustic echo sounder | |||
| acoustical sounder; echo sounder; period meter | |||
| acoustic sounder | |||
| |||
| echo-sounder | |||
| 回 声探测器: 5 phrases in 5 subjects |
| Air defense | 1 |
| Earth sciences | 1 |
| Electronics | 1 |
| Geophysics | 1 |
| Oil / petroleum | 1 |
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