A.radio time signal
B.comparison with a timepiece of known error
C.applying the prevailing chronometer rate to previous readings
D.All of the above
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A.National Geospatial-Intelligence Agency
B.Coast Guard
C.Naval Observatory
D.National Ocean Service
A.underlined letters
B.capital letters
C.italics
D.boldface print
A.inconspicuous
B.conspicuous
C.a government facility or station
D.a radio transmitter
A.coast to aircraft operational communications
B.aircraft to ship operational communications
C.lock & bridge communications
D.aircraft to ship navigational communications
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
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Clouds with the prefix “nimbo” in their name（）.
Considering the general circulation of the atmosphere，the wind system between latitudes 30°N and 60°N is commonly called the（）.
Compared to internal structural plating，the exterior hull plating on a ship is usually（）.
Cyclones that have warm sectors usually move（）.
Changing rescuers while carrying out artificial respiration should be done（）.
Clouds form（）.
Complete information on weather broadcasts throughout the world is contained in（）.
Coast Pilots and navigational charts are kept corrected and up-to-date by using the（）.
Control of fire should be addressed（）.
Day-shapes must be displayed（）.