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单选题
Floors aboard ship are（）.
A
also called decks
B
vertical transverse plates connecting the vertical keel with the margin plates
C
large beams fitted in various parts of the vessel for additional strength
D
found in passenger and berthing spaces only
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also called decksB
vertical transverse plates connecting the vertical keel with the margin platesC
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frames to which the tank top and bottom shell are fastened on a double bottomed shipB
transverse members of the ships frame which support the decksC
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longitudinal angle bars fastened to a surface for strength
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frames to which the tank top and bottom shell are fastened on a double bottomed shipB
transverse members of the ships frame which support the decksC
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13.B
11.C
15.D
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three rockets，one of which shall be the buoyant typeC
four rockets，two of which shall be the buoyant typeD
five rockets，two of which shall be the buoyant type
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