單項(xiàng)選擇題Charts showing the coast of Mexico are produced by the United States（）.

A.National Geospatial-Intelligence Agency
B.Coast Guard
C.Naval Observatory
D.National Ocean Service


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1.單項(xiàng)選擇題Chart legends which indicate a conspicuous landmark are printed in（）.

A.underlined letters
B.capital letters
C.italics
D.boldface print

2.單項(xiàng)選擇題Chart legends printed in capital letters show that the associated landmark is（）.

A.inconspicuous 
B.conspicuous
C.a government facility or station
D.a radio transmitter

3.單項(xiàng)選擇題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

4.單項(xiàng)選擇題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

5.單項(xiàng)選擇題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