问题
单项选择题
0n a vessel, the keel is the primary strength member of the lower hull form in which direction?（）.
A.transverse
B.disagonal
C.longitudinal
D.vertical
答案
参考答案：C
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0n a vessel, the keel is the primary strength member of the lower hull form in which direction?（）.
A.transverse
B.disagonal
C.longitudinal
D.vertical
参考答案：C
