当一个襟翼的PCU马达不工作时会有什么后果

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.

How wonderful! The   （）   is made of  （）        .