After three consecutive attempts to start the APU, the flight crew must wait for _ _ _ _ _ _ before the next attempt to start.
A.60 min B.45 min C.30 min D.15 min正确答案A
After three consecutive attempts to start the APU, the flight crew must wait for _ _ _ _ _ _ before the next attempt to start.
A.60 min B.45 min C.30 min D.15 min正确答案A
