Which one of the following methods is generally considered the best fo

1.	Which one of the following methods is generally considered the best for tunnel ventilation ?
A.	Driving a drift through the tunnel
B.	'Blow in' method
C.	'Blow out' method
D.	Combination of 'Blow in' and 'Blow out' methods
Answer» E.

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Which one of the following methods is generally considered the best for tunnel ventilation ?

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