478.Install the O-ring in the internal groove of the spherical bearing ( )

　将 O 形环安装在锥形轴承的内部凹槽中

　将 O 形环安装在圆柱形轴承的内部凹槽中

　将 O 环安装在球形轴承的内部凹槽中

正确答案：C

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459.只有批准人员才能操作刹车。 ( )

458.IF THE FLAPS DO NOT FULLY[ ], DO THE TEST AGAIN ( )

457.它包括诸如减震支柱充气等项目。 ( )

456.Make sure the tail is no sign of contact ground ( )

455.Oh , sorryJohnI forgot to return the wrench to you —That’s all rightYou can give it to me tomorrow whenever you are free( )

454.Accumulator is a component in a hydraulic system that allows a noncompressible fluid ,
such as oil, to be stored under pressure( )

453.这些测试应不需要安装在飞机上以外的任何特殊设备或设施,并应与机组执行的测试相比较。( )

452.drink water with Xxx illness can occur ( )

451.指示必须与表格中的值一致。 ( )

450.The flap angles are specified in table 1 ( )