管道系统 : 59 phrases in 17 subjects |
Aviation | 2 |
Combustion gas turbines | 2 |
Construction | 3 |
Ecology | 1 |
Electronics | 5 |
Environment | 1 |
General | 23 |
Medical | 1 |
Missiles | 1 |
Nautical | 2 |
Oil / petroleum | 2 |
Oil and gas | 2 |
Oil processing plants | 1 |
Oilfields | 1 |
Technology | 10 |
Thermal engineering | 1 |
United Nations | 1 |