The foreground that this craft reform technique can used for the main well coal of the of the same kind type the room, the craft has the unique, the foreground that expansion application is vast.

此项工艺改造技术可用于同类型的主井撒煤硐室，工艺具有独创性，推广应用的前景广阔。

youdao

The foreground that this craft reform technique can used for the main well coal of the of the same kind type the room, the craft has the unique, the foreground that expansion application is vast.

此项工艺改造技术可用于同类型的主井撒煤硐室，工艺具有独创性，推广应用的前景广阔。

youdao