在正方体
中,过它的任意两条棱作平面,则能作得与
成
角的平面的个数为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e26d9636ad77369535852c6e4493446a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ac09dc1ca2cdd7aef28c218763d3e4d.png)
A.2个 | B.4个 | C.6个 | D.8个 |
更新时间:2017-04-17 19:11:31
|
【知识点】 线面角的概念及辨析
相似题推荐
单选题
|
适中
(0.65)
【推荐1】在三棱锥
中.作
平面
,垂足为
.
①若三条侧棱
与底面
所成的角相等,则
是
的( )心;
②若三个侧面
与底面
所成的二面角相等,则
是
的( )心:
③若三组对棱
与
与
与
中有两组互相垂直,则
是
的( )心
以上三个空依次填( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41e5db1d2fd912f77923e4c120a7dc19.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d30637da200a07672ae231b4c5c09cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
①若三条侧棱
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76696ce4b54de375ff219bf452339f6e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
②若三个侧面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/316e922000c17ca7ed1d620efb5a826d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
③若三组对棱
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a6e2867f32d3f1c3cd36cd3a11a8580.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c015029d8c35b7b062248756f97a3564.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/483324879de464825ba921d7b492ac16.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
以上三个空依次填( )
A.外,垂,内 | B.内,外,垂 | C.垂,内,外 | D.外,内,垂 |
您最近一年使用:0次
单选题
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适中
(0.65)
【推荐2】一条直线与直二面角的两个面所在平面所成的角分别是
,则
的取值范围是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc14778010a33f90902ff17b1ec0ac73.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8dc4c63a548b91061528aa11058de75.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次