单项选择题
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
单项选择题 If you are on the beach and are signaling to a small boat in distress that your present location is dangerous and they should land to the left，you would（）.
单项选择题 If more than one raft is manned after the vessel has sunk，you should（）.
单项选择题 If an airplane circles a vessel 3 times，crosses the vessel’s course close ahead while rocking the wings，and heads off in a certain direction，what does this indicate（）.