984、When you replace a word, always make sure that the alternative you select does not change the meaning of the sentence.

504、Clean the exterior of the equipment and its mounting shelf hardware using a vacuum cleaner and brush!

503、The two most common types of engines used in helicopters are the reciprocating engine and theturbine engine.

502、如果过滤器在异常短的时间后堵塞，将它们送到实验室进行污染分析。

501、如果它们掉落，会出现永久性损坏。

500、The listed technical names are only examples, This is not the complete list of all possible technicalnames.

499、Manually override the start sequence.

498、Drill a hole at the intersection of the two lines.

497 、 Utilizing an airplane as intended by the manufacturer, combined with sound inspection andmaintenance practices/ , forms the/ basis for assuring the airplane remains airworthy and safe to operate.

496、你有权免费复制或出版本文件或其任何后续修改或修订的全部或部分内容。

495 、Install packing and backup rings on bearing. Slide bearing into cylinder until bottomed. 在轴承上安装填料和支撑环。将轴承滑入气缸直到底部。