If your radiotelephone fails while underwa
题型：单项选择题
问题：
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