On a vessel，the keel is the primary strength member of the lower hull form in which direction?（）.<br>A:transverse<br>B:diagonal<br>C:longitudinal<br>D:vertical

On a vessel，the keel is the primary strength member of the lower hull form in which direction?（）.
A:transverse
B:diagonal
C:longitudinal
D:vertical

出自：海船船员证

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