The speed(s) for which ground roll distances were determined should be higher than the power-off stall speed for the same configuration.
答案解析
解析：
**题目:** The speed(s) for which ground roll distances were determined should be higher than the power-off stall speed for the same configuration.
**选项:**
- A: 起飞滑跑距离所需的速度应高于相同构型下的无动力失速速度。
- B: 确定地面拉起距离的速度应高于相同构型的发动机关断失速速度。
- C: 确定地面滑跑距离的速度应该高于相同配置下的断电失速速度。
**正确答案:** C
### 详细解析
1. **地面滑跑距离（Ground Roll Distance）**是指从飞机开始加速到起飞直至离开地面的整个过程的滑跑距离。这个距离取决于飞机的起飞重量、跑道的坡度、天气条件等因素。
2. **断电失速速度（Power-off Stall Speed）**是指飞机在没有发动机推力的情况下，达到的最小飞行速度。此速度是在飞机配置、重量和气动特性下的最小速度。
#### 关键概念：
- **失速速度**是飞机在特定配置下，空气流速不足以提供足够升力导致飞机失去升力的速度。断电失速速度是指在没有引擎功率的情况下的失速速度。
- **起飞滑跑距离**所需的速度（即起飞速度）需要高于断电失速速度，因为飞机必须达到足够的速度才能产生足够的升力使其离开地面。
#### 生动例子：
想象你正在进行一场接力赛跑。在比赛开始时，你需要一定的加速距离才能达到最佳的跑步速度，以便在起跑线上顺利地跑起来。类似地，飞机在起飞时需要一个加速过程，从而达到足够的速度来克服地面摩擦力和产生升力。
如果你在比赛中以低于你的“最佳跑步速度”去跑步，你可能无法顺利跑出起跑线。飞机也一样，如果其起飞速度低于断电失速速度，那么它将无法有效产生升力，可能导致滑跑不够，无法顺利起飞。
### 结论
选择**C选项**的原因是因为在确定飞机的地面滑跑距离时，所需的速度必须高于断电失速速度。这确保了飞机有足够的速度以产生升力，克服地面摩擦力，从而安全起飞。如果速度低于失速速度，飞机无法顺利起飞，滑跑距离会显著增加，这不符合飞行操作的要求。
相关知识点：
地面滑跑速度高于失速速
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