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Multiple Choice Questions
1. Pick up the correct statement from the following during tunnel excavation,
(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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