單項選擇題

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

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單項選擇題

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

單項選擇題

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

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