The double bottom in a vessel is a space comprised of （）<br>A:plating forming the engine room tank top<br>B:doubler plating installed over the flat keel plate<br>C:a watertight boundary formed by the inner bottom<br>D:compartments between the inner and outer bottoms

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

出自：海船船员证

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