灭 火系统 : 157 phrases in 15 subjects |
Architecture | 2 |
Aviation | 5 |
Drilling | 1 |
Exhibitions | 1 |
Forestry | 1 |
Hydroelectric power stations | 8 |
Nautical | 44 |
Navigation | 1 |
Nuclear and fusion power | 1 |
Oil / petroleum | 6 |
Rail transport | 4 |
Shipbuilding | 6 |
Space | 3 |
Technology | 73 |
United Nations | 1 |