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)述了官地銀金礦傳統(tǒng)淺孔留礦采礦法應(yīng)用中存在的突出問(wèn)題,即間柱滯后礦房回采,且占有礦量多,造成地壓集中顯現(xiàn)。
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