单选题The radiotelegraphy safety messages for condition indicating distress，urgency and safety，respectively，are（）.ASOS，ZZZ，XXXBSOS，UUU，SSSCSOS，XXX，TTTDSOS，TTT，UUU
单选题
The radiotelegraphy safety messages for condition indicating distress，urgency and safety，respectively，are（）.
A
SOS，ZZZ，XXX
B
SOS，UUU，SSS
C
SOS，XXX，TTT
D
SOS，TTT，UUU
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