659、The purpose of Such terms is to provide definitions which are of practical value for technical communication.
答案解析
解析：
相关知识点：
术语为技术交流提供定义
相关题目
829、Other information may be displayed on the cover
828、其他信息可能会显示在封面上
827、本系统并不会取代不包括在 CAP 内的断开的正常通讯渠道
826.This system does not supersede the normal channels of communication for items not covered by theCAP这一制度并不取代《共同政策》未涵盖项目的正常沟通渠道
825.The precision of this adjustment is important
824.The precision （精确）of this adjustment is important 这个调整的精确度很重要
823、紧急程序检查单应简明扼要，旨在提醒飞行员检查的项目，但不应提供任何系统操作的细节
822.The emergency procedures check list should be in concise, abbreviated form designed to remind pilotsof items to check without providing details concerning the operation of any system. 紧急程序检查清单应以简洁、缩写的形式，旨在提醒飞行员需要检查的项目，而不提供任何系统运行的细节。
821.Operate the unit for two cycles to remove air from the lines.
820.Operate the unit for two cycles to remove air from the lines. 操作该装置两个循环，从管路中清除空气
