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单选题
If your radiotelephone fails while underway,（）.
A
you must visually signal oncoming vessels
B
you must immediately tie up in the nearest port until the radiotelephone is repaired
C
you must anchor until the radiotelephone is repaired
D
the loss of the radiotelephone must be considered in navigating the vessel
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slow your engines and let the other vessel pass ahead of youD
alter course to port to pass the other vessel on its portside
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