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
正确答案：D
假如你在航行时无线电话出了故障航行中这一情况必须被考虑
