一旦翼尖刹车工作，可以在空中复位吗？

actuator

acquisition

accumulator

accessory drive gearbox

access panel

accelerometer

accelerate

Five-year-old children are too young to go to school,   （）     ?

After Yang Liwei succeeded in circling the earth,     （）   our astronauts desire to do is walk in space.

What surprised me was not what he said but    （）     he said it.