单选题 Pilot：we have been struck by _______,rear fuselage damaged,right elevator lost.

单选题 What is the phenomenon that often affects flight when pilot flies vertically through trough or shear line？

单选题 Turbulence will occur when aircaft in flight encounter_____

单选题 Fair weather cumulus clouds often indicate

单选题 Nanning Control , UAE366,we just encountered severe_______,about 10 passengers have been hurt ,we’ll have to divert nearest airport,request medical assistance on landing.

单选题 Nanning Control, NCR407 encountering moderate icing, our _________is inoperative,request climb

单选题 Which of the follow is not a general weather characteristic associated with cold frints？

单选题 How many tropical cyclones affect the Guangxi region on average every year？