The central longitudinal structural hull strength member of the lower hulls of semisubmersible ship’s is called the（）.<br>A:stress plate<br>B:keel<br>C:rider plate<br>D:main beam

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

出自：海船船员证

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