单项选择题 You have orders to drop off a barge loaded with propylene oxide at a fleet.In doing so，you must ensure that（）.

单项选择题 You are standing the wheelwatch when you hear the cry，“Man overboard starboard side”.You should instinctively（）.

单项选择题 You are standing the wheelwatch on entering port and the Master gives you a rudder command which conflicts with a rudder command from the Pilot.What should you do（）.