When the airplane takes off, the passengers are told to _______ their seat belts.

单选题

When the airplane takes off, the passengers are told to _______ their seat belts.

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单选题

An airplane is in a clean configuration when the _______ ．

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单选题

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

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单选题

when you do a check of the hydraulic fluid quantities or fill the reservoirs,the condition of the airplane is incorrect

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单选题

normally,towing the airplane by the

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