Pick up the correct statement from the following during tunnel excavat – McqOptions

MCQOPTIONS

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.	All of the above.
Answer» E.

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