供气 管 : 46 phrases in 14 subjects |
Architecture | 1 |
Automobiles | 7 |
Aviation | 3 |
Drilling | 1 |
Economy | 1 |
Electronics | 2 |
Hydroelectric power stations | 2 |
Metallurgy | 8 |
Nuclear and fusion power | 1 |
Oil / petroleum | 1 |
Shipbuilding | 1 |
Space | 2 |
Steel production | 1 |
Technology | 15 |