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1 . 已知三棱锥
的所有棱长均为2,点M为
边上一动点,若
且垂足为N,则线段
长的最小值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da78c917ab3631b4a5ba70ef76eb4219.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/167d31eb8432b5c0364316e5048c23dd.png)
A.![]() | B.![]() | C.![]() | D.1 |
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2020-12-03更新
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3卷引用:重庆市巴蜀中学2020-2021学年高二上学期期中数学试题