coal draft

 
  • 煤巷

coal draft的用法和樣例:

例句

  1. Outburst prevention technique of excavating in coal seam will be directly concerned colliery safety production and excavates taking over.
    摘要突出煤層煤巷掘進防突直接關係到煤礦的安全生產和採掘接替。
今日熱詞
目錄 附錄 查詞歷史