 |
| |||
| flight; stair flight; stair slab | |||
| 楼梯段: 38 phrases in 5 subjects |
| Architecture | 5 |
| Construction | 1 |
| General | 4 |
| Hydroelectric power stations | 1 |
| Technology | 27 |
|
| |||
| flight; stair flight; stair slab | |||
| 楼梯段: 38 phrases in 5 subjects |
| Architecture | 5 |
| Construction | 1 |
| General | 4 |
| Hydroelectric power stations | 1 |
| Technology | 27 |