The research is of great reference significance to the mining of the gently inclined and thin ore vein.

其研究结果对缓倾斜极薄矿脉的开采具有重要意义。

youdao

The research is of great reference significance to the mining of the gently inclined and thin ore vein.

其研究结果对缓倾斜极薄矿脉的开采具有重要意义。

youdao