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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