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单选题
The radiotelephone urgency signal is（）.
A
mayday
B
pan pan
C
securite
D
seelonce feenee
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单选题The Urgency Signal（）indicates that the station calling has a very urgent message to transmit concerning the safety of a ship or aircraft，or of some person on board or within sight.A
SOSB
XXXC
TTTD
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单选题If your radiotelephone fails while underway,（）.A
you must visually signal oncoming vesselsB
you must immediately tie up in the nearest port until the radiotelephone is repairedC
you must anchor until the radiotelephone is repairedD
the loss of the radiotelephone must be considered in navigating the vessel
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