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The signal must be given in such a precise way that the pilot cannot confuse.

A You must give the obvious signal in a certain way in order to be seen by the pilot.

B You must stand on a specific road, that is a clear signal for the pilot.

C You must give the pilot the clear sign a that is not misunderstood by the pilot.

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正确答案：A （备注：此答案有误）

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