单项选择题
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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单项选择题
Branford reef is（）.
A.a hard sand shoal marked with a light
B.completely submerged at all stages of the tide
C.surrounded by rocks awash at low water spring tides
D.a small，low，sandy islet surrounded by shoal water -
单项选择题
An orange and white buoy with a rectangle on it displays（）.
A.directions
B.distances
C.locations
D.All of the above -
单项选择题
An orange and white buoy marking an area where operating restrictions are in effect will be marked with which symbol? （）
A.Open-faced diamond
B.Diamond with a cross
C.Circle
D.Rectangle
