Pick up the mechanical ventilation method used for tunnels from the fo – McqOptions

MCQOPTIONS

1.	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» E.

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