 |
| |||
| 回声测距法; 回声范围; 回声距离 | |||
| 回声波测距法 | |||
| 回声测距【定位】 | |||
| 回波测距; 回声测距; 回声定位 | |||
| 回声测距 (法) | |||
| |||
| 回声测距〔定位〕; 回波测距法 | |||
| 回声测距; 回声探鱼; 回声定位 | |||
| echo ranging: 31 phrases in 10 subjects |
| Air defense | 1 |
| Aviation | 2 |
| Earth sciences | 3 |
| Electronics | 3 |
| Explosives and Explosive Ordnance Disposal | 1 |
| General | 1 |
| Geophysics | 4 |
| Navigation | 2 |
| Oil / petroleum | 3 |
| Technology | 11 |