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

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

出自：海船船员证

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