 |
| |||
| 阶段矿房采矿法块矿沿阶段高度方向只布置一个矿房，矿房用深孔〈中深孔〉落矿,并借重力放矿的空场采矿法。矿房采完后再用适当方法回采矿柱 | |||
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