After a vessel transmits the original distress mes...
单选题

After a vessel transmits the original distress message,what signal should be sent to allow ships to take RDF bearings?()

发布日期:2021-03-22

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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