protecting pillar 中文意思是什麼
protecting pillar
解釋
保安礦柱- protecting : 保護
- pillar : n 1 柱；紀念柱；（柱）墩，柱腳；【礦物】（礦井中硬炭層或巖石形成的）礦柱，煤柱。2 柱狀物〈水柱，...
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The device of loading coal and protecting pillar in conventionally - mechanized coal winning technology face
普采工作面裝煤護柱裝置 -
Analyzing to the phenomenon of underground pressure and the stress of surrounding rock in roadway protecting pillar
大煤柱護巷礦壓顯現規律及圍巖應力實測分析
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