单选题What best describes an anchor buoy（）.AA black ball that is hoisted when the ship anchorsBA buoy attached to the anchorCA buoy attached to the scope of an anchor chainDA mark of the number of fathoms in an anchor chain
单选题
What best describes an anchor buoy（）.
A
A black ball that is hoisted when the ship anchors
B
A buoy attached to the anchor
C
A buoy attached to the scope of an anchor chain
D
A mark of the number of fathoms in an anchor chain
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