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Buoys are marked with reflective material to assist in their detection by searchlight. Which statement is TRUE? （）
A:A safe-water buoy will display red and white vertical stripes of reflective material
B:All reflective material is white because it is the most visible at night
C:A special-purpose mark will display either red or green reflective material to agree with its shape
D:A preferred-channel buoy displays either red or green reflective material to agree with the top band of color

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出自：海船船员证

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