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

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

出自：海船船员证

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