油 开 关 : 114 phrases in 19 subjects |
Architecture | 1 |
Automobiles | 38 |
Aviation | 7 |
Compressors | 2 |
Construction | 2 |
Earth sciences | 1 |
Electric machinery | 1 |
Electricity | 1 |
Electronics | 5 |
General | 1 |
Hydroelectric power stations | 2 |
Mechanics | 1 |
Metallurgy | 2 |
Oil / petroleum | 4 |
Rail transport | 1 |
Shipbuilding | 1 |
Space | 2 |
Technology | 41 |
Wind Energy | 1 |