单选题Reserve buoyancy is the（）.Aunoccupied space below the waterlineBvolume of intact space above the waterlineCexcess of the buoyant force over the gravity forceDdifference in the buoyant force in salt and fresh waters
单选题
Reserve buoyancy is the（）.
A
unoccupied space below the waterline
B
volume of intact space above the waterline
C
excess of the buoyant force over the gravity force
D
difference in the buoyant force in salt and fresh waters
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