1792. The factory has maintained technical assistance and parts support according to the stated policies

The factory＇s policy of providing consulting remains unchanged.

The factory has been maintaining technical and component support within the policy scope.

The factory＇s policy on providing technical and component support has change from the past.

正确答案：B

设备系统操作理论翻译

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1571. 扰流板用于增加飞行中的飞机阻力,或在着陆期间以及中断起飞的情况下破坏升力

1570. The lower seal comes into view when you pull the lower bearing down

1569. After repair, do not use acetone to clean these parts

1568. 用于存储和输送新鲜饮用水的系统部分。如果饮用水也用于洗济,则包括洗涤水系统。

1567. 包括附件部分整流罩、整流片、整流罩支架、连接和锁定机构等项目的功能和维护方面,不包括与机身一体的结构,其应包含在对应的结构章节中。

1566. 发动机及所有附件使用同一种润滑油。

1565. That portion of the system common to more than one subsystem which is used for pressurizing supply tanks to insure fluid flow

1564. 文本应尽可能简明扼要。

1563. Use the specified tool to seal the opening

1562. Make sure that the parts are loosely assembled