| |||
| 回波脉冲 | |||
| 回声脉冲 | |||
| 回脉冲 | |||
| |||
| 回波〔回声〕脉冲 | |||
| 回波脉冲 | |||
|
echo- pulse : 34 phrases in 14 subjects |
| Air defense | 1 |
| Aviation | 2 |
| Business | 2 |
| Chemistry | 1 |
| Communications | 1 |
| Earth sciences | 1 |
| Electronics | 1 |
| Geophysics | 1 |
| Metallurgy | 1 |
| Mining | 1 |
| Oil / petroleum | 5 |
| Space | 2 |
| Technology | 11 |
| Telecommunications | 4 |