垂线与平行线例1
https://v.qq.com/txp/iframe/player.html?vid=w0660h9afim&width=500&height=375&auto=0
苏四数上8 垂线与平行线 知识点+总结
垂线与平行线例2-3https://v.qq.com/txp/iframe/player.html?vid=e0661j5qy97&width=500&height=375&auto=0
垂线与平行线例4-5https://v.qq.com/txp/iframe/player.html?vid=e0661j5qy97&width=500&height=375&auto=0
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