 |
| |||
| 掘进断面曾称“毛断面”。井巷掘进时开挖的符合设计要求的横断面 | |||
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