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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
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单选题0n a vessel, the keel is the primary strength member of the lower hull form in which direction?（）.A
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waterlineB
freeboard deckC
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serve as the vessel's main strength memberC
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单选题Which mooring line prevents sideways motion of a vessel moored to a pier（）.A
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单选题Which action will affect the trim of a vessel? （）A
Moving high weights lowerB
Adding weight at the tipping centerC
Moving a weight forwardD
Moving lower weight high
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