 |
| |||
| 声音吸收 | |||
| 声音吸收 | |||
| absorption of sound: 8 phrases in 7 subjects |
| Architecture | 1 |
| Aviation | 1 |
| Ecology | 1 |
| Electronics | 1 |
| Plastics | 1 |
| Shipbuilding | 1 |
| Technology | 2 |
|
| |||
| 声音吸收 | |||
| 声音吸收 | |||
| absorption of sound: 8 phrases in 7 subjects |
| Architecture | 1 |
| Aviation | 1 |
| Ecology | 1 |
| Electronics | 1 |
| Plastics | 1 |
| Shipbuilding | 1 |
| Technology | 2 |