 |
| |||
| combined ventilation | |||
| mixed ventilation | |||
| 混合 通风: 12 phrases in 5 subjects |
| Business | 1 |
| Electric machinery | 5 |
| Electronics | 1 |
| Hydroelectric power stations | 1 |
| Technology | 4 |
|
| |||
| combined ventilation | |||
| mixed ventilation | |||
| 混合 通风: 12 phrases in 5 subjects |
| Business | 1 |
| Electric machinery | 5 |
| Electronics | 1 |
| Hydroelectric power stations | 1 |
| Technology | 4 |