 |
| |||
| pulse echo | |||
| 脉冲回波: 31 phrases in 12 subjects |
| Agriculture | 1 |
| Air defense | 1 |
| Aviation | 2 |
| Earth sciences | 1 |
| Electronics | 4 |
| General | 1 |
| Metallurgy | 3 |
| Oil / petroleum | 3 |
| Plastics | 1 |
| Space | 3 |
| Technology | 8 |
| Telecommunications | 3 |
|
| |||
| pulse echo | |||
| 脉冲回波: 31 phrases in 12 subjects |
| Agriculture | 1 |
| Air defense | 1 |
| Aviation | 2 |
| Earth sciences | 1 |
| Electronics | 4 |
| General | 1 |
| Metallurgy | 3 |
| Oil / petroleum | 3 |
| Plastics | 1 |
| Space | 3 |
| Technology | 8 |
| Telecommunications | 3 |