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如图,四边形ABCD为矩形纸片,把纸片ABCD折叠,使点B恰好落在CD边的中点E处,折痕为AF,若CD=6,则AF等于( )
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A.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101190154782075924/SYS201311011901547820759006_ST/0.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101190154782075924/SYS201311011901547820759006_ST/1.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101190154782075924/SYS201311011901547820759006_ST/2.png)
D.8
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已知:如图,E(-4,2),F(-1,-1),以O为位似中心,按比例尺 1:2,把△EFO缩小,则点E的对应点E′的坐标为( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101190154782075924/SYS201311011901547820759005_ST/images0.png)
A.(2,-1)或(-2,1)
B.(8,-4)或(-8,4)
C.(2,-1)
D.(8,-4)
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在同一平面直角坐标系中,一次函数y=ax+b和二次函数y=ax
2+bx的图象可能为( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101190154782075924/SYS201311011901547820759004_ST/images0.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101190154782075924/SYS201311011901547820759004_ST/images1.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101190154782075924/SYS201311011901547820759004_ST/images2.png)
D.
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由几个大小相同的小正方体组成的立体图形的俯视图如图所示,则这个立体图形应是下图中的( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101190154782075924/SYS201311011901547820759003_ST/images0.png)
A.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101190154782075924/SYS201311011901547820759003_ST/images1.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101190154782075924/SYS201311011901547820759003_ST/images2.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101190154782075924/SYS201311011901547820759003_ST/images3.png)
D.
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如图,⊙O内切于△ABC,切点为D、E、F,若∠B=50°,∠C=60°,连接OE,OF,DE,DF,∠EDF等于( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101190154782075924/SYS201311011901547820759002_ST/images0.png)
A.45°
B.55°
C.65°
D.70°
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