单选题For a floating vessel，the result of subtracting KG from KM is the（）.Aheight of the metacenterBheight of the righting armCheight of the center of buoyancyDmetacentric height
单选题
For a floating vessel，the result of subtracting KG from KM is the（）.
A
height of the metacenter
B
height of the righting arm
C
height of the center of buoyancy
D
metacentric height
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