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

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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

单项选择题

A bold reef is a reef（）.

A.with part of it extending above the water
B.that can be detected by water turbulence
C.that drops off sharply
D.perpendicular to the current