306.Aerodynamic forces are the basic forces acting on an aircraft in flight that are caused by the movement of the air over the surfaces Thurst acts forward , drag acts rearward , lift acts vertically upward and weight acts vertically downward( )

631.Remove the oil and the grease with a degreasing agent( )

630.The flight data recorder system gets and stores airplane parameters from airplane systems and sensors ( )

629.缓慢并完全伸出冲压空气涡轮,并确保它不触碰其他部件 ( )

628.Leave landing gear extended for ten minutes( )

627.The emergency procedures check list should be in concise, abbreviated form designed to remind pilots of items to check without providing details concerning the operation of any system( )

626.The manufacturer recommends that you prepare the mixture in an area with good airflow( )

625.清洁表面以确保粘接符合要求 ( )

624.Calculate the thickness of the shim as follows: t=x-y( )

623.Inspection of the lavatory rapid-decompression device( )

622.Maintain the power lever at the start" position until the specified minimum oil temperature is reached ( )"