Floors aboard ship are（）.<br>A:frames to which the tank top and bottom shell are fastened on a double bottomed ship<br>B:transverse members of the ships frame which support the decks<br>C:longitudinal beams in the extreme bottom of a ship from which the ship's ribs start<br>D:longitudinal angle bars fastened to a surface for strength

Floors aboard ship are（）.
A:frames to which the tank top and bottom shell are fastened on a double bottomed ship
B:transverse members of the ships frame which support the decks
C:longitudinal beams in the extreme bottom of a ship from which the ship's ribs start
D:longitudinal angle bars fastened to a surface for strength

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