如图,在直三棱柱
中,
是边长为2的正三角形,
,N为棱
上的中点,M为棱
上的动点,过N作平面ABM的垂线段,垂足为点O,当点M从点C运动到点
时,点O的轨迹长度为( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/6/29/3e385d3a-d4ac-41b4-9bc4-bcafe1d81a15.png?resizew=214)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8d927585a17c2e98ef7d5a9589a26ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11ddc92d84d188c66b435664a7e7b5a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d88bf46ad08f9677c37eed1d0369329.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/6/29/3e385d3a-d4ac-41b4-9bc4-bcafe1d81a15.png?resizew=214)
A.![]() | B.![]() | C.![]() | D.![]() |
更新时间:2022-06-27 17:48:23
|
相似题推荐
单选题
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适中
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解题方法
【推荐1】在正方体
中,点
在四边形
内(含边界)运动.当
时,点
的轨迹长度为
,则该正方体的表面积为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
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A.6 | B.8 | C.24 | D.54 |
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【推荐2】月牙泉,古称沙井,俗名药泉,自汉朝起即为“敦煌八景” 之一,得名“月泉晓澈”,因其形酷似一弯新月而得名,如图所示,月牙泉边缘都是圆弧,两段圆弧可以看成是
的外接圆和以
为直径的圆的一部分,若
,南北距离
的长大约
m,则该月牙泉的面积约为( )(参考数据:
)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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A.572m2 | B.1448m2 | C.![]() | D.2028m2 |
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解题方法
【推荐1】如图,在四棱锥
中,
平面
,底面
为直角梯形,
,
,且
,
,
、
分别为线段
、
上的一点(端点除外),满足
,则当实数
的值为( )时,
为直角.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/faeb97acf19bd3b2c6c77c2814df4d2f.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d4db9b82b67efe45a02fca32bfcf5dc.png)
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A.![]() | B.![]() | C.![]() | D.![]() |
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解题方法
【推荐2】如图,在正三棱柱
中,底面边长为1,侧棱长为
,
为
中点,
为
中点,则异面直线
与
所成角的余弦值为( )
![](https://img.xkw.com/dksih/QBM/2020/12/27/2622779446009856/2624835492937728/STEM/16f84a23dcf245deb4107a0cb0d0799d.png?resizew=121)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38387ba1cadfd3dfc4dea4ca9f613cea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0a851907ada2ac2c3c4880a6736d28a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
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解题方法
【推荐1】如图,四边形
是正方形,
平面
,则图中互相垂直的平面共有( )
![](https://img.xkw.com/dksih/QBM/2021/10/15/2830071967825920/2830162435407872/STEM/910abd8b47e843848ba41caa1f13eedd.png?resizew=189)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2fa7bbd7831e9ff4f8cffc8889d34f05.png)
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A.4组 | B.5组 | C.6组 | D.7组 |
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解题方法
【推荐2】如图,四棱锥
中,底面
是矩形,
,
平面
,下列叙述中错误的是( )
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
A.![]() ![]() | B.![]() |
C.![]() | D.平面![]() ![]() |
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解题方法
【推荐1】在三棱锥
中,平面
平面
,
和
都是边长为
的等边三角形,若
为三棱锥
外接球上的动点,则点
到平面
距离的最大值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
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A.![]() | B.![]() |
C.![]() | D.![]() |
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【推荐2】如图,把边长为4的正方形ABCD沿对角线AC折起,当直线BD和平面ABC所成的角为
时,三棱锥
的体积为( )
![](https://img.xkw.com/dksih/QBM/2020/12/16/2615422659018752/2634390251544576/STEM/4674243f-e9f8-46a8-87f7-7f4eb4b48466.png?resizew=368)
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