单项选择题
To prevent loss of stability from free communication flooding you should（）.
A.close the cross-connection valve between the off-center tanks B.completely flood high center tanks C.ballast double bottom wing tanks D.close any opening to the sea in an off-center tank
单项选择题 To improve your vessel’s stability in a hazardous situation，you should（）.
单项选择题 To ensure the ship’s general stability，（）.
单项选择题 The vertical distance between G and M is used as a measure of（）.
