单项选择题

A buoy，being a shape of cylinder and with red group flashing，shows that it is（）.

A.left-side buoy
B.right-side buoy
C.a buoy of safety
D.a buoy of danger

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单项选择题

A buoy with a composite group-flashing light indicates a(n)（）.

A.anchorage area
B.fish net area
C.bifurcation
D.dredging area

单项选择题

A buoy marking a wreck will show a(n)（）.

A.white light FL (2) and a topmark of 2 black spheres
B.occulting green light and may be lettered
C.yellow light and will be numbered
D.continuous quick white light and may be numbered