... free fall apparatus自由降落装置 free fall trajectory自由降落轨道 free fall weir自两溢吝 ...
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When is the plane at its highest point of its trajectory and how high is it above the point where it started when it turned the engines off when it went into free fall?
飞机在飞行轨迹的最高点，是什么时候，此时距离出发点，也就是关闭引擎的时刻，高度相差多少？，什么时候开始自由落体？
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