解题方法
1 . 已知
直线,
是平面,给出下列说法,其中正确的说法序号为( )
①若
,则
或
;
②若
,则
;
③若
不垂直于
.则
不可能垂直于
内的无数条直线;
④若
且
,则
且
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/280860dd039e1305a5ccc455f63e8223.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61ba63ad02b1d5af2982fac3d91eb15c.png)
①若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8c1b755be4ad1b0999070ef79d7bd02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b59b1a01a6da42ff2a41e5b91ea301ad.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a53cd751c44ad4d9ebd8e3243e751321.png)
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acd3ef9f7bb4d2ab64c4c713d6ace64d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac3c0daa473ebcef025bf44e46bfd963.png)
③若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
④若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dbf7172403709a1dd33a2a183f95f55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63f84e2761ae07f726d789e4f3ca4b62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df0d37b44de48de51555fa95d94e33f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a9d6ca6fed060a95127579051f7a6b79.png)
A.①② | B.②③ | C.③④ | D.②④ |
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