If the aircraft is parked on a slope, make sure that the wheel chocks are in position.
答案解析
解析：
### 题干分析
题干是：“If the aircraft is parked on a slope, make sure that the wheel chocks are in position.” 这句话的意思是“如果飞机停在斜坡上，确保轮挡在位。” 这里的“wheel chocks”指的是轮挡，是一种用于防止飞机在停放时意外滑动的设备。
### 选项分析
- **A. 如果飞机停在机坪上，确保轮子刹车在位。**
- 这个选项提到的是“机坪”，而不是“斜坡”。虽然在机坪上确保刹车是重要的，但题干强调的是斜坡的情况，因此这个选项不符合题意。
- **B. 如果飞机停靠在廊桥，一定确保轮档在位。**
- 廊桥是连接航站楼和飞机的通道，通常情况下飞机在廊桥上是平坦的，不需要特别的轮挡。因此，这个选项也不符合题意。
- **C. 如果飞机停在斜坡上，确保轮挡在位。**
- 这个选项直接对应题干的内容，强调了在斜坡上停车时使用轮挡的重要性，确保飞机不会因为重力而滑动。
### 正确答案
因此，正确答案是 **C**。这个选项不仅与题干内容一致，而且强调了在特定情况下（斜坡）采取的安全措施。
### 深入理解
为了帮助你更好地理解这个知识点，我们可以联想到日常生活中的一些例子：
1. **停车时的安全措施**：
- 想象一下你在一个斜坡上停车，比如在山坡上。如果你不拉手刹或者不放置石头（类似于轮挡），车子可能会因为重力而滑下去。这就是为什么在斜坡上停车时，采取额外的安全措施是非常重要的。
2. **飞机的特殊性**：
- 飞机比汽车重得多，且在停放时如果没有适当的措施，可能会造成严重的安全隐患。轮挡的使用可以有效防止飞机在停放时意外滑动，保护地面工作人员和设备的安全。
### 总结
相关知识点：
飞机停斜坡确保轮挡在位
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