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| CO₂ fire extinguishing system | |||
| carbon dioxide fire extinguishing system | |||
| carbon dioxide carbon dioxide extinguishing system; CO₂ fire-extinguishing system | |||
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二氧 化 碳灭火系统 : 4 phrases in 3 subjects |
| Nautical | 1 |
| Rail transport | 1 |
| Technology | 2 |
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