单项选择题

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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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（）.

A.fire a green star to the left
B.send the letter K by light and point to the left
C.place an orange signal to your left as you signal with a white light
D.send the code signal S followed by L

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If more than one raft is manned after the vessel has sunk，you should（）.

A.Go in a different direction in search of land
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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（）.

A.The plane is in distress and will have to ditch
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C.Someone is in distress in that direction and the vessel should follow and assist
D.There is danger ahead and the best course is indicated by the direction of the aircraft