单选题If you hear the firing of a gun at one minute intervals from another vessel，this indicates that（）.Athe gun is being used to sound passing signalsBthe vessel is in distressCall vessels are to clear the areaDall is clear and it is safe to pass
单选题
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
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