单项选择题
A neutral equilibrium position for a vessel means that the metacenter is（）.
A.lower than the keel B.at the same height as the center of gravity C.exactly at midships D.at the center of the waterplane area
单项选择题 A load line of a ship is assigned by（）.
单项选择题 A floating vessel will behave as if all of its weight is acting downward through the（）.
单项选择题 A continual worsening of the list or trim indicates（）.
