单项选择题

Which hazard probably would NOT be encountered when entering an empty but uncleaned fish hold?（）

A.Lack of oxygen
B.Methane gas
C.Hydrogen sulfide gas
D.Carbon monoxide

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When starting CPR on a drowning victim，you should（）.

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

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When carrying out a parallel track search pattern，the course of the search units should normally be which of the following?（）

A.In the same direction as the anticipated drift
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VHF Channel 6 is used exclusively for what kind of communications?（）

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C.Working with helicopters
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