 |
| |||
| 低航线 | |||
| track low: 12 phrases in 5 subjects |
| Agriculture | 1 |
| Air defense | 2 |
| Hydroelectric power stations | 1 |
| Rail transport | 4 |
| Technology | 4 |
|
| |||
| 低航线 | |||
| track low: 12 phrases in 5 subjects |
| Agriculture | 1 |
| Air defense | 2 |
| Hydroelectric power stations | 1 |
| Rail transport | 4 |
| Technology | 4 |