单项选择题
A white buoy with an open-faced orange diamond on it indicates（）.
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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相关考题
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单项选择题
A white buoy with a blue band is（）.
A.an isolated danger mark
B.a hydrographic data collection buoy
C.a mooring buoy
D.marking a restricted area -
单项选择题
A V-shaped ripple with the point of the V pointing upstream in a river may indicate a（）.
A.submerged rock，not dangerous to navigation
B.sunken wreck，not dangerous to navigation
C.towed-under buoy
D.All of the above -
单项选择题
A vessel is（）when she is not at anchor，made fast to the shore，or aground.
A.underway
B.making way
C.dead in the water
D.a power driven vessel
