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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第1题

[单选题] 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?（）

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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第2题

[单选题] An airplane wants a vessel to change course and proceed towards a vessel in distress. The actions of the aircraft to convey this message will NOT include（）.

A、circling the vessel at least once B、heading in the direction of the distress location C、flashing the navigation lights on and off D、crossing ahead and rocking the wings

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第3题

[单选题] When a point rotates about an axis and, at the same time, moves parallel to that axis, it describes （）.

A、a line B、a circle C、a helix D、an epllicate

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第4题

[单选题] When hitting a solid object such as ship or an airplane,the radar waves are reflected back（）they came.

A、in the way B、the way C、by the way D、through the path

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第5题

[单选题] An airplane should NOT send which signal in reply to a surface craft?（）

A、Opening and closing the throttle B、Rocking the wings C、Flashing the navigational lights off and on D、Flashing Morse T