 |
| 关闭阀: 65 phrases in 19 subjects |
| Agriculture | 2 |
| Architecture | 1 |
| Automobiles | 3 |
| Aviation | 3 |
| Drilling | 3 |
| Electric machinery | 1 |
| Electronics | 2 |
| General | 2 |
| Hydroelectric power stations | 1 |
| Metallurgy | 5 |
| Mining | 4 |
| Oil / petroleum | 10 |
| Oil processing plants | 1 |
| Plastics | 4 |
| Refrigeration | 1 |
| Shipbuilding | 2 |
| Space | 1 |
| Technology | 18 |
| Wind Energy | 1 |