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  7. "__如下图所示的是2010年9月10日晚上某国东北部数百万只鸟的迁徙轨迹,(圆圈表示鸟的密度,颜色表示雷达的回波强度,箭头所指的是鸟的迁徙方向,箭头的长度表示鸟的飞行速度)。__"
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  14. "![p](picx.png)"
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