Pick up the correct statement from the following during tunnel excavat

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%
Answer» E.

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The following tunnels were constructed in different countries for different purposes : 1. Emperor Claudius built the first Roman tunnel2. The first highway tunnel was constructed in Hungary3. The first underground railway tunnel was constructed in Great Britain4. The first navigational tunnel was constructed in France.The correct chronological development of these tunnels is:
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Pick up the correct statement from the following during tunnel excavation,

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