已知向量
,则下列向量中与
成
的夹角的是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cfb8c4ab37e542eb833cbc5935be0e19.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/969604545902c9a66549a4a44ec3a3c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1e5fa72f2878b476bc57f0df12d6555.png)
A.![]() | B.![]() | C.![]() | D.![]() |
18-19高二下·湖北襄阳·期中 查看更多[2]
更新时间:2019-04-17 22:56:04
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【知识点】 空间向量夹角余弦的坐标表示
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【推荐1】已知空间中三点
,
,
,则下列结论正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf215bb6e25e2250c8f9af7f0b6beb17.png)
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A.![]() ![]() | B.![]() ![]() |
C.![]() ![]() ![]() | D.平面![]() ![]() |
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【推荐2】图1是中国古代建筑中的斗拱结构,
,
是互相垂直横梁,
是与横梁垂直的立柱,从柱顶
上加的一层层探出成弓形的承重结构即为斗拱
.在某古代建筑中
(图2),记
,
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,则
( )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/4/66f2b9d7-5637-4cda-8b9d-c7d5e8a1e2e8.png?resizew=286)
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A.![]() | B.![]() | C.![]() | D.![]() |
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