A.inconspicuous
B.conspicuous
C.a government facility or station
D.a radio transmitter
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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
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
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Corrosive liquids and acids should have which kind of label?（）
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Chronometer error may be found by（）.
Channel 13 is primarily used for ship to ship communication. Channel 13 is also authorized for（）.
Chart legends which indicate a conspicuous landmark are printed in（）.
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Denebola is found in what constellation?（）
Clean air standards referred to as “Grade D” apply to compressed air for use in（）.
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Control of fire should be addressed（）.