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Discussion :: Waste Water Engineering

  1. A safety lamp when inserted in the upper portion of a manhole causes flames. It indicates the presence of

    2. A.

     Carbondioxide gas
    B.

     Hydrogen sulphide gas
    C.

     Methane gas
    D.

     Petrol vapours

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    Workspace

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    Answer : Option C

    Explanation :

    Explanation Not Provided

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