 |
| |||
| on-board oxygen generation; oxygen system | |||
| 氧气系统: 42 phrases in 7 subjects |
| Aviation | 21 |
| Metallurgy | 5 |
| Nautical | 1 |
| Space | 7 |
| Technology | 6 |
| Textile industry | 1 |
| Water resources | 1 |
|
| |||
| on-board oxygen generation; oxygen system | |||
| 氧气系统: 42 phrases in 7 subjects |
| Aviation | 21 |
| Metallurgy | 5 |
| Nautical | 1 |
| Space | 7 |
| Technology | 6 |
| Textile industry | 1 |
| Water resources | 1 |