单项选择题

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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狭水道、冰区与运河航行

A vessel which is being assisted by an icebreaker should indicate that she is ready to cast off the towline by（）.