单项选择题
A.reduce the rolling of the vessel
B.serve as the vessel's main strength member
C.add strength to the bilge
D.protect the vessel's hull when alongside a dock
单项选择题 The fore and aft run of deck plating which strengthens the connection between the beams and the frames and keeps the beams square to the shell is called the（）.
单项选择题 The floors in a vessel’s hull structure are kept from tripping，or folding over，by（）.
单项选择题 The decks of a ship are supported by transverse members called（）.