單項(xiàng)選擇題

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
B.The plane is going to drop a package and wishes the vessel to recover it
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

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單項(xiàng)選擇題

Distress signals may be（）.

A.red flares
B.smoke signals
C.sound signals
D.Any of the above

單項(xiàng)選擇題

By regulation，orange smoke distress signals will expire not more than how many months from the date of manufacture?（）

A.24 months
B.36 months
C.42 months
D.54 months

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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?（）

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Distress signals may be（）.

By regulation，orange smoke distress signals will expire not more than how many months from the date of manufacture?（）

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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?（）

By regulation，orange smoke distress signals will expire not more than how many months from the date of manufacture?（）