（）of the following messages is allowed to be transmitted on the radiotelephone without the authority of the Master.<br>A:Urgency signal<br>B:Safety signal<br>C:Distress signal<br>D:None of the above

（）of the following messages is allowed to be transmitted on the radiotelephone without the authority of the Master.
A:Urgency signal
B:Safety signal
C:Distress signal
D:None of the above

出自：海船船员证

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