If the airplane has fixed landing gear, it is considered to be in a clean configuration when the _______ ．
Aflaps are up
Bgear and flaps are up
Cgear and flaps are down
Dailerons and flaps are up
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If the airplane has fixed landing gear, it is considered to be in a clean configuration when the ___
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students to be familiar with the ______(1)in the reading even if they do not discuss it in class or