| |||
| 虚位移原理 | |||
|
virtual displacement principle : 3 phrases in 3 subjects |
| Agriculture | 1 |
| Hydroelectric power stations | 1 |
| Rail transport | 1 |
| |||
| 虚位移原理 | |||
|
virtual displacement principle : 3 phrases in 3 subjects |
| Agriculture | 1 |
| Hydroelectric power stations | 1 |
| Rail transport | 1 |