If you hear the firing of a gun at one minute intervals from another vessel，this indicates that（）.<br>A:the gun is being used to sound passing signals<br>B:the vessel is in distress<br>C:all vessels are to clear the area<br>D:all is clear and it is safe to pass

If you hear the firing of a gun at one minute intervals from another vessel，this indicates that（）.
A:the gun is being used to sound passing signals
B:the vessel is in distress
C:all vessels are to clear the area
D:all is clear and it is safe to pass

出自：海船船员证

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