underwall

常見例句

• 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(tǒng)淺孔畱鑛採鑛法應(yīng)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(xiàn)。
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