单选题Which is a distress signal? ()AA triangular flag above or below a ballBThe International Code Signal of distress indicated by JVCA green smoke signalDFlames on the vessel as from a burning tar barrel

单选题
Which is a distress signal? ()
A

A triangular flag above or below a ball

B

The International Code Signal of distress indicated by JV

C

A green smoke signal

D

Flames on the vessel as from a burning tar barrel


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