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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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（）.

A.lessening the effect of environmental forces
B.even and symmetrical variable loading
C.local concentration of heavy consumables
D.increasing the metacentric height

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