单项选择题
An unstable upright equilibrium position on a vessel means that the metacenter is（）.
A.lower than the center of gravity B.at the same height as the center of gravity C.higher than the baseline D.on the longitudinal centerline
单项选择题 An upright vessel has negative GM. GM becomes positive at the angle of loll because the（）.
单项选择题 At all angles of inclination，the metacenter is（）.
单项选择题 What is MTI?（）.
