单选题After a vessel transmits the original distress message，what signal should be sent to allow ships to take RDF bearings?（）ASOS three timesBAdditional transmissions to aid direction findingCE for one minute，followed by T for one minuteDTwo tones，10-15 seconds each
单选题
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
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