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采用鉆井法開鑿立井井筒,鉆井臨時鎖口深度應當大于()。 (單選題)

作者:煤礦安全網 2022-05-27 09:07 來源:煤礦安全網 鉆井法 立井井筒 鉆井 鎖口 深度 單選題
題目信息:

  采用鉆井法開鑿立井井筒,鉆井臨時鎖口深度應當大于()。 (單選題)

  A.3m

  B.3.5m

  C.4m

答案

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