单项选择题
The central longitudinal structural hull strength member of the lower hulls of semisubmersible ship’s is called the（）.
A.stress plate
B.keel
C.rider plate
D.main beam
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Support of ship side plating is provided primarily by transverse（）.
A.beams
B.girders
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单项选择题
Structural stress on a ship can be reduced by（）.
A.lessening the effect of environmental forces
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单项选择题
Structural stress levels in a ship are the sum of loading stresses and stresses due to（）.
A.environmental loads
B.variable loads
C.ballast loading
D.mooring loads
