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對定向長鉆孔預抽煤巷條帶煤層瓦斯區域防突措施進行分段檢驗時,每段不得少于( ???)個檢驗測試點。 (單選題)

作者:煤礦安全網 2022-05-25 10:48 來源:煤礦安全網 鉆孔 煤巷 條帶 煤層 瓦斯 區域 措施 單選題
題目信息:

  對定向長鉆孔預抽煤巷條帶煤層瓦斯區域防突措施進行分段檢驗時,每段不得少于( )個檢驗測試點。 (單選題)

  A.2

  B.3

  C.4

  D.5

答案

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