A.frequent
B.so frequent
C.frequent that
D.so frequent that
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A.keeping a close watch and lookout
B.taking a radar range and bearing
C.observing a radar target and listening to signals
D.keeping a well clear caution
A.from
B.on
C.in
D.of
A.a continuous ringing for 10 seconds
B.one short ring followed by one long ring
C.two long rings of at least 20 seconds
D.a continuous ringing until the fire is extinguished
A.gives up
B.gives away
C.gives in
D.gives off
A.the chief engineer
B.the person about whom the entry concerns
C.one other crew member
D.no other signature is required
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()is on the panel of radar.
Despite the rising importance and great convenience of the gyrocompass,the magnetic compass still retain its importance because of its().
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Which of the following is not an operation mode of AIS?()
Berthing means bringing a vessel to her berth until().
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()is where the crew eat their meals.
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Which of the following shall not the officers in charge of the navigational watch do?()