已知
,
均为单位向量,则
是
的
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb80eb942aafb194fadc473776f35b1d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/433b94c39737727e53468df419d8314a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa5aa846a5b7c96fe2ce665eb1ea5f0e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42119c0f73b0ff822cd5138bfd4e1403.png)
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 |
更新时间:2020-05-07 15:02:31
|
相似题推荐
单选题
|
适中
(0.65)
名校
【推荐1】数列
的前
项和
,则“
”是“数列
为等比数列”的( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0e52a6cf4845a1e6844e92d7c582b2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6de1d395e6c48c0676a1488a299479d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
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 |
您最近一年使用:0次
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解题方法
【推荐2】.已知
直线
与直线
平行,
,则
是
的
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51441c8788ff11be766766227793246d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da5604e5d0faed7fdd910bc139bcac31.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2bca22dd008d24dfab3416741a41a963.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06bef3b047b5b2733424d4861dc8c293.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1010846eeec6c9da29640f5aa3f8738.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9aa8a716a31b0f51b70fdf9bdb257909.png)
A.充要条件 | B.充分不必要条件 |
C.必要不充分条件 | D.既不充分也不必要条件 |
您最近一年使用:0次
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【推荐1】设点
是线段
的中点,点
在直线
外,若
,
,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59d2affcec2c77a60688520fb72843c8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3fbcd6c68b53a7450290518d2355093d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91f07e6e06373bf8e42e5667b4b5275c.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
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【推荐2】已知平面向量
,
,
,
,
,若
,则
的最大值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a2f4b1178f68bd147d1a2a6acd04435.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c94075193c11fe43f2396cff5a485054.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d366d8fbb7258ee051f49977441e14a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e093477bc479a1d9c8089d5bfe4b6da9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c5b1fb7b52cc301cfcb65198add84e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d8f91f865b9187628f1b6656e2b9ebc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85e687ec8f6c55f9a49af42c05c31538.png)
A.8 | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次