Which is a distress signal? （）
- AA triangular flag above or below a ball
- BThe International Code Signal of distress indicated by "JV"
- CA green smoke signal
- DFlames on the vessel as from a burning tar barrel
问题
Which is a distress signal? （）
参考解析：
分类：遇险通信题库
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2、Which is NOT a distress signal? （）
Which is NOT a distress signal? （）AA continuous sounding with any fog signal apparatusBA signal sent by radiotelephone consisting of the spoken word "Mayday"CAn International Code Signal of N.C.DThe firing of green star rockets or shell
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6、All stations which receive a distress
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