单选题The distance from the still water level (corrected for tides and storm surge) to the bottom of the hull of a ship is the（）.Aair gapBfreeboardCpenetrationDwater depth
单选题
The distance from the still water level (corrected for tides and storm surge) to the bottom of the hull of a ship is the（）.
A
air gap
B
freeboard
C
penetration
D
water depth
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