问题
单项选择题
A buoy having red and green horizontal bands would have a light characteristic of（）.
A.group occulting
B.composite group flashing
C.Morse letter A
D.quick flashing
答案
参考答案：B
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A buoy having red and green horizontal bands would have a light characteristic of（）.
A.group occulting
B.composite group flashing
C.Morse letter A
D.quick flashing
参考答案：B