单项选择题
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
A buoy having red and green horizontal bands would have...
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
A bold reef is a reef（）.A.with part of it extending abo...
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
（）means the curve on the earth’s surface which cuts all...
单项选择题（）means the curve on the earth’s surface which cuts all the meridians at the same angle.
A.Great Circle B.Position Line C.Rhumb line D.True Bearing
