如图,正方体
的棱长为1,线段
上有两个动点E、F,且
.结出结论:①AC⊥BE;②EF
平面ABCD;③三棱锥A-BEF的体积为定值;④
的面积与△BEF的面积相等.其中正确的结论是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8cfbc0b5a8fbde804bd8425a4b76d207.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f115f2683c0422042f1846450885e7fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a9bfa68259d7a331be323b2038d628a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c105d6ba18fbb0581fb982175e2eac9.png)
A.①②③; | B.①②④ | C.②③④ | D.①③④ |
更新时间:2022-04-21 15:30:13
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【推荐1】如图,线段
是圆的直径,圆内一条动弦
与
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沿直径
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A.![]() | B.![]() | C.3 | D.1 |
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【推荐2】已知
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【推荐1】已知m,n是两条不同的直线,
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【推荐2】如图所示,在正方体ABCD-A1B1C1D1中,与平面AB1C平行的直线是( )
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【推荐1】已知正四面体
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【推荐1】在正四棱柱
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【推荐2】已知
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