Three short blasts of the whistle means（）.<br>A:danger<br>B:I am in distress<br>C:the vessel is not under command (broken down)<br>D:I am operating astern propulsion

Three short blasts of the whistle means（）.
A:danger
B:I am in distress
C:the vessel is not under command (broken down)
D:I am operating astern propulsion

出自：海船船员证

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