单项选择题
Channel 13 is primarily used for ship to ship communication. Channel 13 is also authorized for（）.
A.coast to aircraft operational communications
B.aircraft to ship operational communications
C.lock & bridge communications
D.aircraft to ship navigational communications
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Changing rescuers while carrying out artificial respiration should be done（）.
A.without losing the rhythm of respiration
B.only with the help of two other people
C.by not stopping the respiration for more than 5 minutes
D.at ten minute intervals -
单项选择题
Carbon dioxide as a fire fighting agent has which advantage over other agents?（）
A.It causes minimal damage
B.It is safer for personnel
C.It is cheaper
D.It is most effective on a per unit basis -
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Camphor oil is classified as a（）.
A.Grade A flammable liquid
B.Grade C flammable liquid
C.Grade D combustible liquid
D.Grade E combustible liquid
