单选题Three SHORT BLASTS mean（）.AI am altering my course to starboardBI am altering my course to portCI am operating astern propulsionDI am operating ahead propulsion
单选题
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
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