443.The dust cap on the air charging valve is removed, the external air source is connected to the valve stem and the swivel nut turned to open the air charging valve ( )

　在充气活门上的防尘螺帽被拆下来了,这样新鲜的空气源才能被连接到气门杆和螺套上,以打开充气阀门。

　在充气阀门上的可调节螺帽被拆除了,这样新鲜的空气源才能被连接到气门杆和螺套上,以打开充气阀门。

　充气阀门上的防尘帽被拆除,外接气源连接到阀门杆,旋转螺母被旋开以打开充气阀门。

正确答案：C

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494.最大允许误差 5 毫米。( )

493.Use gloves when you touch parts with edge serrations ( )

492.Connect tow bar to nose landing gear ( )

491.Keep the backup file in a safe area ( )

490.谁该干这项工作,这个问题需要考虑。 ( )

489.Initial stall tests and other dynamic maneuvers have been run , as well as an extensive check-out of the airplanes systems( )

488.Install the forward cargo compartment aft bulkhead center panel( )

487.The Table of Contents required by paragraph 09 of this Specification may be in the form of a log [or list] of the Supplements( )

486.这个程序这时不适用。( )

485.This boiler controller is applicable to all systems thus, it can also control thermal oil heaters ( )