单选题In ship construction，keel scantlings should be the greatest（）.Aat each frameBamidshipsCone-third the distance from the bowDone-third the distance from the stern
单选题
In ship construction，keel scantlings should be the greatest（）.
A
at each frame
B
amidships
C
one-third the distance from the bow
D
one-third the distance from the stern
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