All of the following are distress signals EXCEPT（）.<br>A:the continuous sounding of any fog signal apparatus<br>B:giving five or more short and rapid blasts of the whistle<br>C:firing a gun at intervals of about a minute<br>D:a barrel with burning oil in it，on deck

All of the following are distress signals EXCEPT（）.
A:the continuous sounding of any fog signal apparatus
B:giving five or more short and rapid blasts of the whistle
C:firing a gun at intervals of about a minute
D:a barrel with burning oil in it，on deck

出自：海船船员证

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