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局部通風機及其開關地點附近10m以內風流中,瓦斯濃度不超過(? )時,方可人工開啟局部通風機。

題目信息:

  局部通風機及其開關地點附近10m以內風流中,瓦斯濃度不超過( )時,方可人工開啟局部通風機。

  A. 0.5%

  B. 1.0%

  C. 1.5%

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