 |
| |||
| acoustic ray | |||
| 声学线: 15 phrases in 7 subjects |
| Air defense | 1 |
| Automobiles | 1 |
| Earth sciences | 1 |
| Electronics | 1 |
| General | 1 |
| Oil / petroleum | 3 |
| Technology | 7 |
|
| |||
| acoustic ray | |||
| 声学线: 15 phrases in 7 subjects |
| Air defense | 1 |
| Automobiles | 1 |
| Earth sciences | 1 |
| Electronics | 1 |
| General | 1 |
| Oil / petroleum | 3 |
| Technology | 7 |