单选题The central longitudinal structural hull strength member of the lower hulls of semisubmersible ship’s is called the（）.Astress plateBkeelCrider plateDmain beam
单选题
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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