单项选择题
A.inconspicuous B.conspicuous C.a government facility or station D.a radio transmitter
Channel 13 is primarily used for ship to ship communica...
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
Changing rescuers while carrying out artificial respira...
单项选择题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
Carbon dioxide as a fire fighting agent has which advan...
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
