单项选择题
A.start chest compressions before the victim is removed from the water
B.drain water from the lungs before ventilating
C.begin mouth-to-mouth ventilations as soon as possible
D.do not tilt the head back since it may cause vomiting
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?（）
单项选择题 VHF Channel 6 is used exclusively for what kind of communications?（）
单项选择题 The term MODERATE SPEED was previously interpreted as meaning a speed which would enable a vessel（）within half the range of visibility.