单选题（）refers to the depth of a vessel below the waterline，measured vertically to the lowest part of the hull，propellers or other reference points.AFree boardBStability heightCMetacentric heightDDraft
单选题
（）refers to the depth of a vessel below the waterline，measured vertically to the lowest part of the hull，propellers or other reference points.
A
Free board
B
Stability height
C
Metacentric height
D
Draft
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