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若,,均为单位向量,且,,则的最大值为( ) A. B.1 C. D.2
若
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102420931051851/SYS201311031024209310518008_ST/0.png)
,
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102420931051851/SYS201311031024209310518008_ST/1.png)
,
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102420931051851/SYS201311031024209310518008_ST/2.png)
均为单位向量,且
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102420931051851/SYS201311031024209310518008_ST/3.png)
,
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102420931051851/SYS201311031024209310518008_ST/4.png)
,则
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102420931051851/SYS201311031024209310518008_ST/5.png)
的最大值为( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102420931051851/SYS201311031024209310518008_ST/6.png)
B.1
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102420931051851/SYS201311031024209310518008_ST/7.png)
D.2
考点分析:
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