在正三棱锥
中,顶点
在底面
的射影为点
,则
( )
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
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A.![]() | B.![]() | C.![]() | D.![]() |
23-24高一下·广东河源·期中 查看更多[3]
广东省河源市部分学校2023-2024学年高一下学期5月期中联考数学试题(已下线)6.5.1直线与平面垂直-【帮课堂】(北师大版2019必修第二册)江苏省宿迁市泗阳县两校联考2023-2024学年高一下学期第二次学情调研(5月月考)数学试题
更新时间:2024-05-08 21:42:13
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解题方法
【推荐1】如图所示,
平面
,
,
,且
与
不垂直,则图中直角三角形的个数是( )
![](https://img.xkw.com/dksih/QBM/2021/6/26/2751515827019776/2759780639571968/STEM/723e9a4766b143469c8bb715507a6268.png?resizew=150)
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A.4 | B.5 | C.6 | D.7 |
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【推荐2】已知平面及直线l,则“直线m,使得l⊥m”是“l⊥”的
A.充分不必要条件 | B.必要不充分条件 | C.充要条件 | D.既不充分也不必要条件 |
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【推荐1】已知
,
是两条直线,
是一个平面,下列关于直线与平面位置关系描述正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e9b0f5f44abbc6544a2f672b025b013.png)
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【推荐2】如图,在菱形
中,
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是
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到直线
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