单选题

This is the minimum flight speed at which the airplane is directionally and laterally controllable.

A This is the low limit of flight speed a t which the airplane can be controlled directionally and laterally.

B This is the upper limit of flight speed at which the aircraft is directionally and laterally controllable.

C This is the largest flight speed at which the airplane is directionally and laterally steerable.

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正确答案：A （备注：此答案有误）

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