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| 含气量; 气含量; 气体浓度 | |||
| 瓦斯浓度 | |||
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gas concentration : 24 phrases in 12 subjects |
| Animal husbandry | 1 |
| Aviation | 1 |
| Drilling | 1 |
| Electronics | 3 |
| Explosives and Explosive Ordnance Disposal | 3 |
| Metallurgy | 1 |
| Nursing | 1 |
| Oil / petroleum | 4 |
| Rail transport | 2 |
| Sports | 2 |
| Technology | 4 |
| Water resources | 1 |
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