单项选择题

A yellow buoy may mark a(n)（）.

A.wreck
B.shoal area
C.anchorage area
D.middle ground

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单项选择题

A yellow buoy may exhibit a(n)（）.

A.fixed red light
B.flashing light
C.white light
D.occulting light

单项选择题

A white buoy with an orange rectangle on it displays（）.

A.directions
B.dangers
C.exclusion areas
D.All of the above

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