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
A yellow buoy may exhibit a(n)（）.
An orange and white buoy indicating a vessel-exclusion area will be marked with what symbol? （）
A white buoy with a blue band is（）.
A yellow buoy may mark a(n)（）.
A parallel of latitude other than the equator is a（）.
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 white buoy with an open-faced orange diamond on it indicates（）.
A plane that cuts the Earth’s surface and passes through the poles will always form（）.
A white buoy with an orange rectangle on it displays（）.
A mid-channel buoy，if lighted，will show a（）.