单选题A signal of intent must be sounded in international waters by（）.Aa vessel meeting another head-onBa vessel overtaking another in a narrow channelCa vessel crossing the course of anotherDthe give-way vessel in a crossing situation
单选题
A signal of intent must be sounded in international waters by（）.
A
a vessel meeting another head-on
B
a vessel overtaking another in a narrow channel
C
a vessel crossing the course of another
D
the give-way vessel in a crossing situation
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