295.Jack was down in the mouth because he missed his plane ( )

642.This is the minimum concentration of flammable vapors in air below which propagation of flame does not occur on contact with a source of ignition ( )

641.有原因或没有原因,文本都可以分为一栏或两栏。( )

640.气动系统从气动气源获取压缩空气,并通过管道向用户系统供应压缩空气。 ( )

639.When the preset threshold is reached, the smoke detector triggers a warning via the Cabin Intercommunication Data System ( )

638.Ground Proximity Warning System tells the crew if the aircraft is in a dangerous configuration when it goes hear the ground in a non - predetermined manner ( )

637.A mechanical pressure gage on the oxygen cylinder shows the cylinder pressure regardless of the cylinder shutoff valveposition ( )

636.This limiting rate-of-climb value shall be identified clearly on the chart along with the power and configuration conditions ( )

635.用于指示气源系统的温度和压力的部分。包括温度和压力警告系统。( )

634.Database synchronization is in progress ( )

633.如需变更维修方案,须经设计部门批准。( )