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Discussion :: Tunneling

  1. Pick up the correct statement from the following during tunnel excavation,

    2. A.
    Oxygen should not be less than 19.5%
    B.
    Carbondioxide should not be more than 0.5%
    C.
    Hydrogen sulphide should not be more than 0.001%
    D.
    Carbon mono-oxide should not be more than 0.01%
    E.
    All of the above.

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    Workspace

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    Answer : Option E

    Explanation :

    No answer description available for this question.

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