680、 在简化技术英语( )中段落以“主题句”开头)告诉读者该段的主题是什么

594、Due to frequent changes in, or varying combinations of, some types of equipment such as avionics
and instrumentation, ones or more separate documents for these products may be required.
由于某些类型的设备如航空电子设备和仪器仪表的频繁变化或不同的组合,这些产品可能需要一个或多个
单独的文档。

593、Two persons are necessary ‘to do this procedure.

592、正常操作时,确保释压活门关闭。释压活门打开表示燃油通气系统出现问题。

591、Technical texts often contain long groups of words that have the function of one part of speech in a sentence

590、该规范给出了继电器、二极管和系统其他部件的符号。

589、外界大气温度是指自由空气的静态温度,可从飞机上的温度指示或地面气象源获得,并根据仪器误差
和压缩性效应进行调整。

588、Do the work in an area away from equipment or metal frame buildings

587、Label the tabs with section numbers or titles.

586、Adjust the door operating rod until it aligns with the attachment point.

585、Clean the filter element with a brush. 用刷子清洁滤芯。