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 -
单项选择题
A white buoy with an open-faced orange diamond on it indicates（）.
A.danger
B.vessels are excluded from the area
C.the buoy is a mooring buoy
D.operating restrictions are in effect
