单项选择题
If the weights are moved away from the midship section，（）will happen on board.
A.hogging B.sagging C.stiff D.tender
单项选择题 If the weights are concentrated in the middle part，then（）will happen on board the ship.
单项选择题 If a vessel is sagging，what kind of stress is placed on the sheer strake?（）
单项选择题 Frames to which the tank top and bottom shell are fastened are called（）.
