A.Open-faced diamond
B.Diamond with a cross
C.Circle
D.Square
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A.wreck
B.shoal area
C.anchorage area
D.middle ground
A.fixed red light
B.flashing light
C.white light
D.occulting light
A.directions
B.dangers
C.exclusion areas
D.All of the above
A.danger
B.vessels are excluded from the area
C.the buoy is a mooring buoy
D.operating restrictions are in effect
A.an isolated danger mark
B.a hydrographic data collection buoy
C.a mooring buoy
D.marking a restricted area
最新試題
An orange and white buoy with a rectangle on it displays（）.
A special purpose buoy shall be（）.
A plane that cuts the Earth’s surface at any angle and passes through the center 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（）.
An orange and white buoy marking an area where operating restrictions are in effect will be marked with which symbol? （）
A preferred-channel buoy will show a（）.
A nun buoy will（）.
A spherical buoy may be（）.
An orange and white buoy marking a danger area will have what symbol on it?（）
A rock and sand structure extending from the bank of the river toward the channel is known as a（）.