An orange flag showing a black circle and square is a（）.<br>A:Signal indicating a course change<br>B:Distress signal<br>C:Signal of asking to communicate with another vessel<br>D:Signal indicating danger

An orange flag showing a black circle and square is a（）.
A:Signal indicating a course change
B:Distress signal
C:Signal of asking to communicate with another vessel
D:Signal indicating danger

出自：海船船员证

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