Tunnelling - Tunnelling
Tunnelling (41) Add new question
Question
Q: Pick up the mechanical ventilation method used for tunnels from the following:
Option | Answer | Is Correct |
---|---|---|
1 | blowing fresh air by ducts to the face of tunnel | |
2 | exhausting foul air by ducts from the face of the tunnel and permitting fresh air through the tunnel | |
3 | all the above. |
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