619 、Revisions are to be made consistent with the format of the specification using the provisions of FAR21.50 as a basis. for

　To make reservations consistent with the format of the specifications, the provisions of FAR21.50shouldrbe adopted as abasis.

　By using the basic provisions of FAR21.50, revisions become consistent with the format of the Specification.

　FAR21.50 provisions are the basic to the revisions which are consistent with the format of the specification.

正确答案：C

解析：

解析:注释: consistent 致的。provisions 提供,供给:adopt 采用,采取。

869、Detection system is used to detect and indicate the formation of ice. 探测系统用于探测和指示冰的形成。

868、De-energize the system. 关闭系统电源。

867、Database synchronization is in progress.

866、Continuing Airworthiness Program Inspections usually consist of two pages one text page and oneillustration page.

865、Connect the towing arm to the nose gear. 连接牵引臂和前起落架。

864、 Connect the disconnected wires.

863、 Comments are located directly below the repair/modification section, extending from the left to theright margins. 注释位于修复/修改部分的正下方，从左到右空白延伸。

862、Close valve "A" when you get the same indications on gauges “X” AND”Y” 当压力表“X”和“Y”的指示相同时，关闭阀门“A

861、 CALTION：WHEN YOU REMOVE THE PROBES, DO NOT LET THEM TOUCH EACH OTHER.

860、 Carefully put the valve assembly in its position and install the spacers and the bolts.