A light signal consisting of three flashes means （）.<br>A:I am in doubt as to your actions<br>B:My engines are full speed astern<br>C:I desire to overtake you<br>D:I am operating astern propulsion

A light signal consisting of three flashes means （）.
A:I am in doubt as to your actions
B:My engines are full speed astern
C:I desire to overtake you
D:I am operating astern propulsion

出自：海船船员证

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