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| What is the name of an internal passage of watertight construction fitted along the centerline between the double-bottoms of some ships, usually from the forepeak to the forward machinery space bulkhead, used to carry pipe work along the length of the ship to the various holds or tanks? |
| A) Duct keel |
| B) Vertical keel |
| C) Bar keel |
| D) Pipe keel |
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