单选题A vessel which is being assisted by an icebreaker should indicate that she is ready to cast off the towline by（）.Adisplaying code letter Y (Yankee)Bsounding five short blasts on his whistleCdisplaying code numeral 5Dsounding one prolonged blast on his whistle
单选题
A vessel which is being assisted by an icebreaker should indicate that she is ready to cast off the towline by（）.
A
displaying code letter Y (Yankee)
B
sounding five short blasts on his whistle
C
displaying code numeral 5
D
sounding one prolonged blast on his whistle
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