A.danger
B.vessels are excluded from the area
C.the buoy is a mooring buoy
D.operating restrictions are in effect
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A.an isolated danger mark
B.a hydrographic data collection buoy
C.a mooring buoy
D.marking a restricted area
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
最新試題
A yellow buoy may mark a(n)（）.
A rock and sand structure extending from the bank of the river toward the channel is known as a（）.
A parallel of latitude other than the equator is a（）.
A preferred-channel buoy may be（）.
A relative bearing is always measured from（）.
An orange and white buoy indicating a vessel-exclusion area will be marked with what symbol? （）
Fishing stake，the position of which frequently（），exist in the area covered by this chart.
A plane that cuts the Earth’s surface and passes through the poles will always form（）.
A structure，usually made of stone，or cement pilings，which extends from the bank at approximately right angles to the current is called a（）.
A nun buoy will（）.