单选题Air gap is the vertical distance between the bottom of the hull and the（）.Astill water levelBwave crestCwave crest plus the charted water depth and tidal correctionsDwave crest plus the charted water depth and tidal correction and storm surge
单选题
Air gap is the vertical distance between the bottom of the hull and the（）.
A
still water level
B
wave crest
C
wave crest plus the charted water depth and tidal corrections
D
wave crest plus the charted water depth and tidal correction and storm surge
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