单选题Which display indicates a vessel conducting mineclearance operations（）.AThree balls in a vertical lineBTwo balls in a vertical lineCOne ball near the foremast and one ball at each yardarmDOne diamond near the foremast and one ball at each yardarm
单选题
Which display indicates a vessel conducting mineclearance operations（）.
A
Three balls in a vertical line
B
Two balls in a vertical line
C
One ball near the foremast and one ball at each yardarm
D
One diamond near the foremast and one ball at each yardarm
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