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若向量a,b满足|a|=,|b|=2,(a-b)⊥a,则向量a与b的夹角等于( ...
若向量a,b满足|a|=
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,|b|=2,(a-b)⊥a,则向量a与b的夹角等于( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102311060775322/SYS201311031023110607753003_ST/1.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102311060775322/SYS201311031023110607753003_ST/2.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102311060775322/SYS201311031023110607753003_ST/3.png)
D.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102311060775322/SYS201311031023110607753003_ST/4.png)
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