题目内容：
简述起落架转换活门的作用。
参考答案：【答案仅供学习，请勿对照自行用药等】
问答题,简答题：简述起落架转换活门的作用。
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This box can hold more book than that one.
This box can hold more book than that one.
They thought that there must be something wrong with their TV set.
They thought that there must be something wrong with their TV set.
There is a large amount of energy wasted due to friction.
There is a large amount of energy wasted due to friction.
Their parents don’t know them as well as their friends do.
Their parents don’t know them as well as their friends do.
Air is all around us.
Air is all around us.