单选题A change of trim may be simply defined as（）.Athe change in difference between the forward and aft draftsBthe sum of free communication，free surface and pocketingCthe moment of inertia of the ship's waterline plane about the athwartship axisDrolling and listing
单选题
A change of trim may be simply defined as（）.
A
the change in difference between the forward and aft drafts
B
the sum of free communication，free surface and pocketing
C
the moment of inertia of the ship's waterline plane about the athwartship axis
D
rolling and listing
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