438.Sometimes , especially for complex airplanes , it may be necessary to provide specific training in the proper maintenance of the airplane and its systems ( )

499.Comments are located directly below the repair/modification section, extending from the left to the right margins ( )

498. The Sections on "Limitations" and "Emergency Procedures" are placed ahead of "NormalProcedures"，"Performance"，"Weight and Balance" and other sections to provide easier accessto information that may be required in flight

497.在某些情况下,如果数据表明,疲劳问题开始发生的飞行小时数比最初预测的要多, 则有可能延长检查的间隔。( )

496.Put a warning notice in the cockpit to tell persons not to operate the flight controls ( )

495.Remove the detergent with a clean cotton wiper that is moist with water ( )

494.最大允许误差 5 毫米。( )

493.Use gloves when you touch parts with edge serrations ( )

492.Connect tow bar to nose landing gear ( )

491.Keep the backup file in a safe area ( )

490.谁该干这项工作,这个问题需要考虑。 ( )