A vessel which is being assisted by an icebreaker would display a flag hoist consisting of the code numeral “4”when the vessel（）.<br>A:speed begins to drop<br>B:stops<br>C:receives ice damage<br>D:becomes icebound

A vessel which is being assisted by an icebreaker would display a flag hoist consisting of the code numeral “4”when the vessel（）.
A:speed begins to drop
B:stops
C:receives ice damage
D:becomes icebound

出自：海船船员证

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