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| calibrating gas; standard gas | |||
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标准 气 体 : 17 phrases in 8 subjects |
| Aviation | 4 |
| Explosives and Explosive Ordnance Disposal | 4 |
| General | 3 |
| Nautical | 1 |
| Oil / petroleum | 2 |
| Refrigeration | 1 |
| Space | 1 |
| Technology | 1 |
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