1 . 如图,在正方体
中,
为棱
的中点.动点
沿着棱
从点
向点
移动,对于下列四个结论:
①存在点
,使得
;
②存在点
,使得
平面
;
③
的面积越来越小;
④四面体
的体积不变.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/6/28b3e593-565f-4c3f-83a6-695972e13ad0.png?resizew=157)
其中,所有正确的结论的个数是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56f7ba05c54b3de1f4378f7c8eb58328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
①存在点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/656aceec19543470bd58ed3d304d155d.png)
②存在点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4645450a006f2c20087486d0833afbb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e1e007fb94902451b22b4e15fe06b08.png)
③
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5c1b7f8c6e4793af4336d02addfbfbb.png)
④四面体
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6738d05f0c7e4f0076fd5c094a4fb51c.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/6/28b3e593-565f-4c3f-83a6-695972e13ad0.png?resizew=157)
其中,所有正确的结论的个数是( )
A.1 | B.2 | C.3 | D.4 |
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