试题详情

I think the gear is jammed, but I‘m not sure about it, request _______ .

The dog _______ the rabbit but could not catch it.

The _______ situation is a condition of being concerned about safety and of requiring timely, but n

“If there is one thing I’m sure about,it is that in a hundred years from now we will still be readi

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