The ventilation system uses differential pressure to pull air out of the airplane. The air moves through overboard vents from the cabin galley and the lavatory areas.
答案解析
解析：
### 题干解析
题干提到“通风系统使用压力变化将空气抽出飞机”，这说明通风系统的工作原理是基于压力差的。飞机在飞行时，机舱内的气压通常高于外部气压，因此通过控制这种压差，可以有效地将机舱内的空气排出。
### 选项分析
- **A选项**：通风系统使用压力变化将机外空气抽入。空气从客舱厨房和盥洗室区域流经机外通风孔。
- **错误**：这个选项描述的是将机外空气抽入，而不是将机舱内的空气抽出，和题干的意思相反。
- **B选项**：通风系统使用不同的压力将空气抽出飞机外。空气流经客舱厨房和盥洗室区域然后到机外通风孔。
- **部分正确**：这个选项提到“抽出飞机外”，符合题干的意思，但“流经机外通风孔”这个表述不够准确，应该是“流出”而不是“流经”。
- **C选项**：通风系统使用压差将空气抽出飞机外。空气从客舱厨房和盥洗室区域的机外通风孔流出。
- **正确**：这个选项准确地描述了通风系统的工作原理，强调了“压差”这一关键因素，并且清楚地说明了空气的流出方向。
### 知识点总结
通风系统在飞机中的作用非常重要，尤其是在高空飞行时，机舱内的空气质量和压力需要保持在一个适宜的水平。通过利用压差，通风系统能够有效地将机舱内的废气和热量排出，确保乘客的舒适和安全。
### 生动例子
可以将这个过程想象成一个气球。当你用嘴吹气球时，气球内部的空气压力会增加。如果你在气球的一侧戳一个小孔，气球内的空气就会因为内部压力高于外部压力而迅速流出。飞机的通风系统就像这个气球，通过控制机舱内外的压力差，确保空气能够顺利流出，保持机舱内的空气清新。
相关知识点：
通风系统用压差抽气外流
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