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已知,,())=23,那么与夹角为( ) A.60° B.90° C.120° ...
已知
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025123805649013737/SYS201310251238056490137007_ST/0.png)
,
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025123805649013737/SYS201310251238056490137007_ST/1.png)
,(
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)
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025123805649013737/SYS201310251238056490137007_ST/3.png)
)=23,那么
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025123805649013737/SYS201310251238056490137007_ST/4.png)
与
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夹角为( )
A.60°
B.90°
C.120°
D.150°
考点分析:
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