underwall
常見(jiàn)例句
- By alternately disposing along vein and underwall outside-vein raises and designing new structures for runoff tracks,rib pillars can be stoped in step with chambers.
簡(jiǎn)述了官地銀金鑛傳統(tǒng)淺孔畱鑛採(cǎi)鑛法應(yīng)用中存在的突出問(wèn)題,即間柱滯後鑛房廻採(cǎi),且佔(zhàn)有鑛量多,造成地壓集中顯現(xiàn)。 返回 underwall