Civil Engineering - Tunnelling - Discussion

16.

Pick up the mechanical ventilation method used for tunnels from the following:

[A].	blowing fresh air by ducts to the face of tunnel
[B].	exhausting foul air by ducts from the face of the tunnel and permitting fresh air through the tunnel
[C].	blowing fresh air and exhausting foul air by ducts
[D].	all the above.

Answer: Option D

Explanation:

No answer description available for this question.

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