53.Use cellophane to prevent damage to the surface ( )

885.Magnetic Chip Detector [MCD]is a magnetic plug in sumps of lubricated components for detection of internal failure of the component ( )

884.The moment is the product of the weight of an item multiplied by its arm ( )

883.监视无线电高度计指示器。( )

882.Turn the aileron control wheel quickly counter-clockwise( )

881.机械员拆下钢索滑轮,详细检查周围区域,没有发现其他缺陷。( )

880.L1 登机门飞行机组位置救生衣未安装。 ( )

879.燃油样品检查发现有微生物污染。 ( )

878.The positive pressure relief valves are fail safe devices that bleed fuselage pressure overboard if the aft outflow valve fails closed( )

877.It is difficult to understand the words, especially who from out of the area( )

876.However, this operation is recommended to decrease the drying time ( )