449. Generally, the wheels of airplanes are attached to the shock struts, and oil or air is used by the struts to relieve the impact of landing

The wheels of most airplanes are attached to the shock struts which use oil or air to cushion the blow of landing.

The wheels of most airplanes are attached to the shock absorb bolts which use oil or air to eliminate the landing pressure.

The wheels of most airplanes are hinged to the shock struts which use oil or air to cushion the landing impact.

正确答案：A

设备系统操作理论翻译

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2914. When there are several words in English for the same thing ( ),STE permits one of these synonyms to the exclusion of the others

2913. 查阅飞机记录本的故障记录以及中央DU或CDU上的相关故障信息,听取机组反映的故障,报告故障并处理。

2912. 在程序句中,冒号前最多可以使用20个单词。

2911. 为达到在整个行业内以合理统一的形式,向飞行员提供与特定飞机的运行相关的必要、有用或期望的信息的目的,手册的起草者应在实际可行的范围内遵循本规范。

2910. Hold the cylinder tightly

2909. 如有必要,增加一个垫片。

2908. 剥去导线的绝缘层

2907. This document provides supplemental to the applicable airplane maintenance manual( )

2906. 这些系统也称为手册的章节。

2905. The overall power package inclusive of engine, air intake, mount, cowling, scoops, cowl flaps, cooling baffles, etc