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

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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
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
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