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如图所示,在空间直角坐标系中,有一棱长为a的正方体ABCO-A′B′C′D′,A...
如图所示,在空间直角坐标系中,有一棱长为a的正方体ABCO-A′B′C′D′,A′C的中点E与AB的中点F的距离为( )
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A.
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a
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025123805649012064/SYS201310251238056490120002_ST/1.png)
a
C.a
D.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025123805649012064/SYS201310251238056490120002_ST/2.png)
a
考点分析:
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以棱长为1的正方体ABCD-A
1B
1C
1D
1的棱AB、AD、AA
1所在的直线为坐标轴,建立空间直角坐标系,则平面AA
1B
1B对角线交点的坐标为( )
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