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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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
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