A.an isolated danger mark
B.a hydrographic data collection buoy
C.a mooring buoy
D.marking a restricted area
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A.submerged rock，not dangerous to navigation
B.sunken wreck，not dangerous to navigation
C.towed-under buoy
D.All of the above
A.underway
B.making way
C.dead in the water
D.a power driven vessel
A.dike
B.revetment
C.cutoff
D.crib
A.numbered
B.lettered
C.green
D.red
A.lighted with a white light
B.striped black and red
C.lighted with a red light
D.yellow
最新試題
An orange and white buoy marking a danger area will have what symbol on it?（）
From your position you observe a rotating white and green light to the north. This light is most likely（）.
Except for N-S courses，and E-W courses on the equator，a great circle track between two points，when compared to a rhumb line track between the same two points，will（）.
A nun buoy will（）.
How is the intensity of a light expressed in the Light Lists?（）.
A plane that cuts the Earth’s surface at any angle and passes through the center will always form（）.
A preferred-channel buoy will show a（）.
Branford reef is（）.
A V-shaped ripple with the point of the V pointing upstream in a river may indicate a（）.
A mid-channel buoy，if lighted，will show a（）.