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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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单选题Which vessel is the stand-on vessel when two vessels crossing in fog are NOT in sight of one another（）.A
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考题
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A black ball in the forepart of her vesselB
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is turning to starboardC
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