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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Compliance with the terms of the load line certificate on a ship is the responsibility of the（）.
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Channel 13 is primarily used for ship to ship communication. Channel 13 is also authorized for（）.
Daylight savings time is a form of zone time that adopts the time（）.
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Deficient oxygen content inside a chain locker can be detected with（）.
Class I and II private aids to navigation in or along navigable waters of the United States are listed in the（）.
Chart legends printed in capital letters show that the associated landmark is（）.
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Compared to a low pressure system，generally the air in a high is（）.