| |||
| 技术问题 | |||
|
engineering problem : 15 phrases in 8 subjects |
| Aviation | 2 |
| Bridge construction | 2 |
| Desert science | 1 |
| Ecology | 1 |
| General | 1 |
| Hydroelectric power stations | 3 |
| Oil / petroleum | 1 |
| Technology | 4 |
| |||
| 技术问题 | |||
|
engineering problem : 15 phrases in 8 subjects |
| Aviation | 2 |
| Bridge construction | 2 |
| Desert science | 1 |
| Ecology | 1 |
| General | 1 |
| Hydroelectric power stations | 3 |
| Oil / petroleum | 1 |
| Technology | 4 |