Large mining depth single seam non-full mining, surface structure has only minor extent of damage.

大采深单一煤层的非充分采动，地面建筑物受损程度很小。

youdao

Large mining depth single seam non-full mining, surface structure has only minor extent of damage.

大采深单一煤层的非充分采动，地面建筑物受损程度很小。

youdao