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| 供氧系统 (只用于吸气) | |||
| 供氧系统 | |||
| 自动供氧系统 | |||
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demand system : 36 phrases in 11 subjects |
| Automobiles | 2 |
| Aviation | 1 |
| Business | 2 |
| Computer networks | 1 |
| Economy | 1 |
| Electronics | 5 |
| Information technology | 1 |
| Management | 1 |
| Space | 7 |
| Technology | 11 |
| Telecommunications | 4 |
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