If a vessel takes a sudden，severe list or trim from an unknown cause，you should FIRST（）.

单项选择题If a vessel lists to port，the center of buoyancy will（）.

A.move to port
B.move to starboard
C.move directly down
D.stay in the same position

单项选择题Horizontal transverse motion of a vessel is known as（）.

A.pitch
B.surge
C.sway
D.heave

单项选择题Horizontal fore or aft motion of a vessel is known as（）.

A.pitch
B.surge
C.sway
D.roll

单项选择题Heave is motion along the（）.

A.longitudinal axis
B.transverse axis
C.vertical axis
D.centerline axis

单项选择题For a vessel with list，a decrease in GMT will cause the angle of inclination to（）.

A.stabilize at an angle of loll
B.decrease
C.increase
D.remain constant