【单选题】
A ?prevent the flaps from being lowered at airspeeds which would impose excessive structural loads.
B ?cause the flap segments located on opposite sides of the aircraft centerline to extend and retract together so that the aircraft will not become aerodynamically unbalanced to the extent that it becomes uncontrollable.
C ?boost normal system pressure to the flaps in order to overcome the air loads acting on the relatively large flap area.
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