In the wooded bulk-head, used for mucking in steep grade tunnels,

1.	In the wooded bulk-head, used for mucking in steep grade tunnels,
A.	one opening is provided
B.	two openings are provided
C.	three openings are provided
D.	no opening is provided.
Answer» C. three openings are provided

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In the wooded bulk-head, used for mucking in steep grade tunnels,

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