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[單選題] 開采容易自燃煤層的采(盤)區,必須設置至少()條專用回風巷。

作者:煤礦安全網 2022-01-14 14:05 來源:煤礦安全網 單選題 選題 開采 容易 自燃 煤層 必須 設置 至少 專用 回風巷
題目信息:

  [單選題] 開采容易自燃煤層的采(盤)區,必須設置至少()條專用回風巷。

  A、 1

  B、 2

  C、 3

答案

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