 |
| |||
| 顶板受压强度系数老顶受压时，采煤工作面支架平均载荷与平时支架平均载荷的比值 | |||
The server is undergoing maintenance and the site is working in read-only mode. Please check back later.">Add | The server is undergoing maintenance and the site is working in read-only mode. Please check back later.">Report an error
| Get short URL | Language Selection Tips