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)。
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