https://v.qq.com/txp/iframe/player.html?vid=e0521i8vm7j&width=500&height=375&auto=0
苏四数上8 垂线与平行线 知识点+总结
苏四数上8 垂线与平行线 例1-例5
https://v.qq.com/txp/iframe/player.html?vid=f0172hriet4&width=500&height=375&auto=0
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