 |
| |||
| strength class grade of concrete | |||
| strength grades of concrete | |||
| concrete mark; grade of concrete; strength grade of concrete | |||
| 混凝土强度等级: 4 phrases in 2 subjects |
| Hydroelectric power stations | 3 |
| Technology | 1 |
|
| |||
| strength class grade of concrete | |||
| strength grades of concrete | |||
| concrete mark; grade of concrete; strength grade of concrete | |||
| 混凝土强度等级: 4 phrases in 2 subjects |
| Hydroelectric power stations | 3 |
| Technology | 1 |