单选题Which is NOT a distress signal? （）AA continuous sounding with any fog signal apparatusBA signal sent by radiotelephone consisting of the spoken word MaydayCAn International Code Signal of N.C.DThe firing of green star rockets or shells
单选题
Which is NOT a distress signal? （）
A
A continuous sounding with any fog signal apparatus
B
A signal sent by radiotelephone consisting of the spoken word Mayday
C
An International Code Signal of N.C.
D
The firing of green star rockets or shells
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