| |||
| 脆弱层 | |||
|
weak layer : 8 phrases in 6 subjects |
| Bridge construction | 3 |
| Chemistry | 1 |
| Electronics | 1 |
| Geophysics | 1 |
| Hydroelectric power stations | 1 |
| Wind Energy | 1 |
| |||
| 脆弱层 | |||
|
weak layer : 8 phrases in 6 subjects |
| Bridge construction | 3 |
| Chemistry | 1 |
| Electronics | 1 |
| Geophysics | 1 |
| Hydroelectric power stations | 1 |
| Wind Energy | 1 |