单项选择题
In a Williamson turn，the rudder is put over full until the（）.
A.vessel has turned 90°From her original course B.vessel has turned 60°From her original course C.vessel is on a reciprocal course D.emergency turn signal sounds
单项选择题 If you see someone fall overboard from a ship，you should（）.
单项选择题 If an emergency pump control is used as the emergency shutdown on a tank vessel，it must（）.
单项选择题 How should you signal the crane operator to stop in an emergency?（）
