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在一个不透明的袋子里,有2个白球和2个红球,它们只有颜色上的区别,从袋子里随机摸...
在一个不透明的袋子里,有2个白球和2个红球,它们只有颜色上的区别,从袋子里随机摸出一个球记下颜色放回,再随机地摸出一个球,则两次都摸到白球的概率为( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101193429807489445/SYS201311011934298074894007_ST/0.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101193429807489445/SYS201311011934298074894007_ST/1.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101193429807489445/SYS201311011934298074894007_ST/2.png)
D.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101193429807489445/SYS201311011934298074894007_ST/3.png)
考点分析:
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如图,在▱ABCD中,AD=2AB,CE平分∠BCD交AD边于点E,且AE=3,则AB的长为( )
A.4
B.3
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D.2
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反比例函数y=
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的图象经过点(-2,3),则k的值为( )
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C.
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D.-
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把抛物线y=(x+1)
2向下平移2个单位,再向右平移1个单位,所得到的抛物线是( )
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B.y=(x+2)
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C.y=x
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D.y=x
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如图所示的几何体是由一些正方体组合而成的立体图形,则这个几何体的俯视图是( )
A.
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C.
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D.
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下列图形中,既是轴对称图形又是中心对称图形的是( )
A.
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B.
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平行四边形
C.
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正五边形
D.
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正六边形
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