单选题An unstable upright equilibrium position on a vessel means that the mrtacenter is（）.Alower than the center of gravityBat the same height as the center of gravityCheigher than the baselineDon the longitudinal centerline
单选题
An unstable upright equilibrium position on a vessel means that the mrtacenter is（）.
A
lower than the center of gravity
B
at the same height as the center of gravity
C
heigher than the baseline
D
on the longitudinal centerline
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