在地面上观察刚刚好从头顶飞过的客机。飞机声音最大时，飞机位置和观察点的连线和地面夹角为α，飞机速度 知乎 Sketch Coloring Page

在地面上观察刚刚好从头顶飞过的客机。飞机声音最大时，飞机位置和观察点的连线和地面夹角为α，飞机速度 知乎 Template

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tomski在地面上观察刚刚好从头顶飞过的客机。飞机声音最大时，飞机位置和观察点的连线和地面夹角为α，飞机速度 知乎 coloring

在地面上观察刚刚好从头顶飞过的客机。飞机声音最大时，飞机位置和观察点的连线和地面夹角为α，飞机速度 知乎 sketch template

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