【必修2】第一章1.2 空间几何体的三视图和直观图

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https://v.qq.com/txp/iframe/player.html?vid=z0370rvpk1u&width=500&height=375&auto=0

https://v.qq.com/txp/iframe/player.html?vid=j0312if30b6&width=500&height=375&auto=0