 |
| |||
| 标准土 | |||
| standard ground: 7 phrases in 5 subjects |
| Aviation | 1 |
| Hydroelectric power stations | 1 |
| Space | 2 |
| Technology | 2 |
| Water resources | 1 |
|
| |||
| 标准土 | |||
| standard ground: 7 phrases in 5 subjects |
| Aviation | 1 |
| Hydroelectric power stations | 1 |
| Space | 2 |
| Technology | 2 |
| Water resources | 1 |