单项选择题
A.The search target is sighted and then lost
B.More than one vessel is available for a search
C.The search object is a target that will be readily detected by radar
D.An aircraft is available to assist a surface vessel
单项选择题 You are proceeding to a distress site．The survivors are in liferafts.What will make your ship more visible to the survivors（）.
单项选择题 You are approaching another vessel and see that it has the signal flag “O” hoisted．What is your next action（）.
单项选择题 When starting CPR on a drowning victim，you should（）.