单项选择题
Support of ship side plating is provided primarily by transverse（）.
A.beams B.girders C.frames D.bulkheads
单项选择题 Structural stress on a ship can be reduced by（）.
单项选择题 Structural stress levels in a ship are the sum of loading stresses and stresses due to（）.
单项选择题 Keel scantlings of any vessel are greatest amidships because（）.
