254.在拖飞机时通常使用哪个系统的液压控制刹车( )In aircraft towing, which hydraulic system usually use to control brake?

448.增压系统的两个控制器在同一时间内的工作状态是( )The two CPC at the same time the working state is

447.防冰活门的作用是( )What is the purpose of the anti-ice valve

446.组件按钮电门上的故障( )灯什么时候亮( )When will the FAULT light of the PACK pushbutton come on

445.FCV活门类型是( )What type is the FCV

444.飞机在地面时,溢流活门处于什么位置( )The aircraft is on the ground, the overboard valve position is( )

443.控制外排活门马达1的计算机是( )The computer of contorl outflow valve motor1 is( )

442.散货舱加温的热空气来源是( )The bulk cargo compartment Heating is performed by( )

441.空调舱通风的目的是什么( )What purpose is of the air conditioning compartment ventilation system

440.与厕所和厨房通风系统有关的控制器是( )The computer that control lavatory and galley ventilation is( )

439.ACM机( )ACM( )