单项选择题
Stable equilibrium for a vessel means that the metacenter is（）.
A.at a lower level than the baseline B.on the longitudinal centerline C.higher than the center of gravity D.at amidships
单项选择题 Ship’s officers should check every cargo compartment after it is filled with bulk grain to ensure（）.
单项选择题 Reinforcing frames attached to a bulkhead on a vessel are called（）.
单项选择题 Progressive flooding on a ship is controlled by securing watertight boundaries and（）.
