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正方形网格中,∠AOB如图放置,则cos∠AOB的值为( ) A. B. C. ...
正方形网格中,∠AOB如图放置,则cos∠AOB的值为( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101192359357089840/SYS201311011923593570898007_ST/images0.png)
A.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101192359357089840/SYS201311011923593570898007_ST/0.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101192359357089840/SYS201311011923593570898007_ST/1.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101192359357089840/SYS201311011923593570898007_ST/2.png)
D.2
考点分析:
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