A buoy having red and green horizontal bands would have a light characteristic of（）.

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

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（）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

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