单项选择题
A.During an engine speed change
B.During a navigational course change
C.Unless the helm is in the“hand”mode
D.All of the above
单项选择题 Who may perform as a lookout（）.
单项选择题 While you are on watch entering port，the Master gives the helmsman a rudder command which conflicts with a rudder command from the Pilot.You should make sure the helmsman（）.
单项选择题 While underway in thick fog you are on watch and hear the cry“man overboard”.Which type of maneuver should you make（）.