试题详情

We have trouble in extending landing gear, we‘d like to _______ .

It’s very kind _______ you to help us when we are in such a trouble.

airplane has fixed landing gear, it is considered to be in a clean configuration when the _______ ．

To keep health, we have to keep _______ hours.

We’re returning due to burst tyre during _______ retraction, we were lucky it didn’t burst in the w