Three SHORT BLASTS mean（）.<br>A:I am altering my course to starboard<br>B:I am altering my course to port<br>C:I am operating astern propulsion<br>D:I am operating ahead propulsion

Three SHORT BLASTS mean（）.
A:I am altering my course to starboard
B:I am altering my course to port
C:I am operating astern propulsion
D:I am operating ahead propulsion

出自：海船船员证

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