 |
| 封闭层: 63 phrases in 19 subjects |
| Automobiles | 1 |
| Business | 1 |
| Drilling | 1 |
| Earth sciences | 1 |
| Ecology | 1 |
| Electronics | 2 |
| Engineering geology | 5 |
| Explosives and Explosive Ordnance Disposal | 1 |
| General | 3 |
| Geology | 1 |
| Hydroelectric power stations | 2 |
| Metallurgy | 1 |
| Nautical | 2 |
| Oil / petroleum | 14 |
| Physics | 1 |
| Plastics | 2 |
| Rail transport | 1 |
| Shipbuilding | 1 |
| Technology | 22 |