单项选择题
A.Steering a sinuous course
B.Steering a zig-zag course
C.Turning on all available deck lights at night
D.Dumping debris over the side to make a trail to your vessel
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（）.
单项选择题 When carrying out a parallel track search pattern，the course of the search units should normally be which of the following（）.