单选题The Plimsoll mark on a vessel is used to（）.Aalign the vessel's tailshaftBdetermine the vessel's trimCdetermine the vessel's freeboardDlocate the vessel's centerline
单选题
The Plimsoll mark on a vessel is used to（）.
A
align the vessel's tailshaft
B
determine the vessel's trim
C
determine the vessel's freeboard
D
locate the vessel's centerline
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