常见例句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. 簡述了官地銀金鑛傳統淺孔畱鑛採鑛法應用中存在的突出問題,即間柱滯後鑛房廻採,且佔有鑛量多,造成地壓集中顯現。 返回 underwall