99.When is the electro manual selector valve supplied ?

　When is the locking shaft proximity switch target is NEAR and when the manual selector valve is operated.

　When is the locking shaft proximity switch target is FAR and when the manual selector valve is operated.

　When is the locking shaft proximity switch target is NEAR.

正确答案：B

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562.What is purpose of the bypass valve?

561.What is the function of the trim air valve?

560.How is the basic temperature regulated by the ACSC?

559.What is the function of each ACSC ?

558.What is the purpose of the pack?

557.Zero Fuel Weight is entered :

556.Pressing the ALIGN IRS Line Select Key on INIT page A:

555.If no company route exists in the data base for your flight, what must be done INIT page A?

554.V2 speed is entered on the:

553.Runway changes should be performed: