【单选题】
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
查看正确答案
A、Red buoy with a horizontal yellow band B、Red and white vertically-striped buoy with a vertical yellow stripe C、Red and white vertically-striped buoy with a red spherical topmark D、Green buoy with a yellow square
