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含气量; 气含量; 气体浓度 | |||
瓦斯浓度 |
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 |