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如图,将一个各面都涂了油漆的正方体,切割为125个同样大小的小正方体,经过搅拌后...
如图,将一个各面都涂了油漆的正方体,切割为125个同样大小的小正方体,经过搅拌后,从中随机取一个小正方体,记它的涂漆面数为X,则X的均值E(X)=( )
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025124305645006301/SYS201310251243056450063008_ST/images0.png)
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025124305645006301/SYS201310251243056450063008_ST/0.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025124305645006301/SYS201310251243056450063008_ST/1.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025124305645006301/SYS201310251243056450063008_ST/2.png)
D.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025124305645006301/SYS201310251243056450063008_ST/3.png)
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已知点A(-1,1),B(1,2),C(-2,-1),D(3,4),则向量
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025124305645006301/SYS201310251243056450063005_ST/0.png)
在
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方向上的投影为( )
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B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025124305645006301/SYS201310251243056450063005_ST/3.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025124305645006301/SYS201310251243056450063005_ST/4.png)
D.
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已知
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025124305645006301/SYS201310251243056450063004_ST/0.png)
,则双曲线
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025124305645006301/SYS201310251243056450063004_ST/1.png)
的( )
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将函数
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025124305645006301/SYS201310251243056450063003_ST/0.png)
的图象向左平移m(m>0)个单位长度后,所得到的图象关于y轴对称,则m的最小值是( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025124305645006301/SYS201310251243056450063003_ST/1.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025124305645006301/SYS201310251243056450063003_ST/2.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025124305645006301/SYS201310251243056450063003_ST/3.png)
D.
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