单选题Continuous sounding of a fog whistle by a vessel is a signal（）.Athat the vessel is anchoredBto request the draw span of a bridge to be openedCof distressDthat the vessel is broken down and drifting
单选题
Continuous sounding of a fog whistle by a vessel is a signal（）.
A
that the vessel is anchored
B
to request the draw span of a bridge to be opened
C
of distress
D
that the vessel is broken down and drifting
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