deep mining of coal pillar

 
  • 深部開採

deep mining of coal pillar的用法和樣例:

例句

  1. Most of large and middle scale open-pit mines in China have reached deep mining.
    摘要我國的大多數大中型露天礦山已經或即將進入深部開採。

deep mining of coal pillar的相關資料:

臨近單詞

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