单选题The double bottom in a vessel is a space comprised of （）Aplating forming the engine room tank topBdoubler plating installed over the flat keel plateCa watertight boundary formed by the inner bottomDcompartments between the inner and outer bottoms
单选题
The double bottom in a vessel is a space comprised of （）
A
plating forming the engine room tank top
B
doubler plating installed over the flat keel plate
C
a watertight boundary formed by the inner bottom
D
compartments between the inner and outer bottoms
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