PDF(3901 KB)
PDF(3901 KB)
PDF(3901 KB)
分岔合并下伏煤层破碎顶板超前注浆加固技术
Pre-grouting Technology for Broken Roof of Lower Coal Seam of Splitting and Merging Coal
| {{custom_ref.label}} |
{{custom_citation.content}}
{{custom_citation.annotation}}
|
/
| 〈 |
|
〉 |