单选题A vessel which is being assisted by an icebreaker would display a flag hoist consisting of the code numeral 4 when the vessel（）.Aspeed begins to dropBstopsCreceives ice damageDbecomes icebound
单选题
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
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