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| 氧气呼吸器面罩 | |||
| 吸氧器; 氧气呼吸器 | |||
| 供氧设备; 供氧装置; 吸氧设备 | |||
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| 供氧设备; 输氧呼吸器; 氧气呼吸器; 氧气设备 | |||
| oxygen breathing apparatus: 1 phrase in 1 subject |
| Aviation | 1 |
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