Discussion :: Tunneling
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Pick up the mechanical ventilation method used for tunnels from the following:
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A.
blowing fresh air by ducts to the face of tunnel
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B.
exhausting foul air by ducts from the face of the tunnel and permitting fresh air through the tunnel
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C.
blowing fresh air and exhausting foul air by ducts
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D.
all the above.
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Answer : Option D
Explanation :
No answer description available for this question.
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