单项选择题
Aboard ship，vertical flat plates running transversely and connecting the vertical keel to the margin plates are called（）.
A.floors B.intercostals C.girders D.stringers
单项选择题 A vessel having continuous closely spaced transverse strength members is（）.
单项选择题 A term applied to the bottom shell plating in a double-bottom ship is（）.
单项选择题 A simplified construction plan may be included in the ship construction portfolio provided it adequately defines the（）.
