After a vessel transmits the original distress message，what signal should be sent to allow ships to take RDF bearings?（）<br>A:SOS three times<br>B:Additional transmissions to aid direction finding<br>C:E for one minute，followed by T for one minute<br>D:Two tones，10-15 seconds each

After a vessel transmits the original distress message，what signal should be sent to allow ships to take RDF bearings?（）
A:SOS three times
B:Additional transmissions to aid direction finding
C:E for one minute，followed by T for one minute
D:Two tones，10-15 seconds each

出自：海船船员证

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