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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相关考题
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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 -
单项选择题
A buoy having red and green horizontal bands would have a light characteristic of（）.
A.interrupted quick flashing
B.composite group flashing
C.Morse (A)
D.quick flashing
