单选题The radiotelegraph alarm signal may be used to announce（）.Athat a distress message will followBa request for assistance in searching for a man overboardCan urgent warning about a cycloneDAll of the above
单选题
The radiotelegraph alarm signal may be used to announce（）.
A
that a distress message will follow
B
a request for assistance in searching for a man overboard
C
an urgent warning about a cyclone
D
All of the above
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