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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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
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
A.Grade A flammable liquid
B.Grade C flammable liquid
C.Grade D combustible liquid
D.Grade E combustible liquid
A.six months
B.one year
C.two years
D.thirty months
A.loss of pay during the period of such use
B.reprimand by the US Coast Guard
C.revocation of license or certificate
D.termination of employment
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Conventional anchors are least likely to hold in a bottom consisting of（）.
Chronometer error may be found by（）.
Chart legends printed in capital letters show that the associated landmark is（）.
Concerning the identification signal for a pilot vessel，in fog，which statement is TRUE?（）
Concerning a celestial observation，the azimuth angle is measured from the principal vertical circle to the（）.
Cyclones that have warm sectors usually move（）.
Compared to internal structural plating，the exterior hull plating on a ship is usually（）.
Define the acronym MSI（）.
Clouds with the prefix “nimbo” in their name（）.
Charts showing the coast of Mexico are produced by the United States（）.