单项选择题
If a vessel takes a sudden，severe list or trim from an unknown cause，you should FIRST（）.
A.determine the cause before taking countermeasures B.assume the shift is due to off-center loading C.counterflood D.assume the cause is environmental forces
单项选择题 If a vessel lists to port，the center of buoyancy will（）.
单项选择题 Horizontal transverse motion of a vessel is known as（）.
单项选择题 Horizontal fore or aft motion of a vessel is known as（）.
